diff --git a/web/client/src/App.tsx b/web/client/src/App.tsx
index f024bd1..4feff07 100644
--- a/web/client/src/App.tsx
+++ b/web/client/src/App.tsx
@@ -170,6 +170,9 @@ class App extends React.Component<IProps, IState> {
               onChange={(e) => {
                 const value = e.target.value
                 this.flowMgr.changeFilterLazy(value, (err) => {
+                  if (err) {
+                    console.log('changeFilterLazy error', err)
+                  }
                   this.setState({
                     filterInvalid: err ? true : false,
                     flows: this.flowMgr.showList()
diff --git a/web/client/src/lib/filter.ts b/web/client/src/lib/filter.ts
index 0dd5b17..3193a0f 100644
--- a/web/client/src/lib/filter.ts
+++ b/web/client/src/lib/filter.ts
@@ -1,9 +1,75 @@
 import type { Flow, Header } from './flow'
+import filterRuleParser from './filterRuleParser'
 
 const FLOW_FILTER_SCOPES = ['url', 'method', 'code', 'header', 'reqheader', 'resheader', 'body', 'reqbody', 'resbody', 'all'] as const
 type FlowFilterScope = typeof FLOW_FILTER_SCOPES[number]
 
+type Rule = IRuleKeyword | IRuleNot | IRuleAnd | IRuleOr
+
+interface IRuleKeyword {
+  type: 'keyword'
+  value: string
+  filter?: FlowFilterKeyword
+}
+
+interface IRuleNot {
+  type: 'not'
+  expr: Rule
+}
+
+interface IRuleAnd {
+  type: 'and'
+  left: Rule
+  right: Rule
+}
+
+interface IRuleOr {
+  type: 'or'
+  left: Rule
+  right: Rule
+}
+
 export class FlowFilter {
+  private rule: Rule | undefined
+  constructor(text: string) {
+    text = text.trim()
+    if (!text) return
+    this.rule = filterRuleParser.parse(text)
+  }
+
+  public match(flow: Flow): boolean {
+    if (!this.rule) return true
+    return this._match(flow, this.rule)
+  }
+
+  private _match(flow: Flow, rule: Rule): boolean {
+    if (rule.type === 'keyword') {
+      return this.getFlowFilterKeyword(rule).match(flow)
+    }
+    else if (rule.type === 'not') {
+      return !this._match(flow, rule.expr)
+    }
+    else if (rule.type === 'and') {
+      return this._match(flow, rule.left) && this._match(flow, rule.right)
+    }
+    else if (rule.type === 'or') {
+      return this._match(flow, rule.left) || this._match(flow, rule.right)
+    }
+    else {
+      // eslint-disable-next-line
+      // @ts-ignore
+      throw new Error(`invalid rule type ${rule.type}`)
+    }
+  }
+
+  private getFlowFilterKeyword(rule: IRuleKeyword): FlowFilterKeyword {
+    if (rule.filter) return rule.filter
+    rule.filter = new FlowFilterKeyword(rule.value)
+    return rule.filter
+  }
+}
+
+export class FlowFilterKeyword {
   private keyword: string | RegExp | undefined
   private scope: FlowFilterScope = 'url'
 
diff --git a/web/client/src/lib/filterRuleParser.js b/web/client/src/lib/filterRuleParser.js
new file mode 100644
index 0000000..d28786d
--- /dev/null
+++ b/web/client/src/lib/filterRuleParser.js
@@ -0,0 +1,765 @@
+/* eslint-disable */
+
+/**
+ * 
+
+Expression
+  = Or
+
+Or
+  = left:And _ "or" _ right:Or { return { type: 'or', left, right }; }
+  / And
+
+And
+  = left:Not _ "and" _ right:And { return { type: 'and', left, right }; }
+  / Not
+
+Not
+  = _ "not" _ expr:Factor { return { type: 'not', expr }; }
+  / Factor
+
+Factor
+  = "(" _ expr:Expression _ ")" { return expr; }
+  / Keyword1
+  / Keyword2
+  / Keyword3
+
+Keyword1
+  = ["]([^"])*["] { return { type: 'keyword', value: text().slice(1, -1) }; }
+
+Keyword2
+  = [']([^'])*['] { return { type: 'keyword', value: text().slice(1, -1) }; }
+
+Keyword3
+  = [^ ()]* { return { type: 'keyword', value: text() }; }
+
+_ "whitespace"
+  = [ \t\n\r]*
+
+ */
+
+module.exports = /*
+ * Generated by PEG.js 0.10.0.
+ *
+ * http://pegjs.org/
+ */
+(function() {
+  "use strict";
+
+  function peg$subclass(child, parent) {
+    function ctor() { this.constructor = child; }
+    ctor.prototype = parent.prototype;
+    child.prototype = new ctor();
+  }
+
+  function peg$SyntaxError(message, expected, found, location) {
+    this.message  = message;
+    this.expected = expected;
+    this.found    = found;
+    this.location = location;
+    this.name     = "SyntaxError";
+
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, peg$SyntaxError);
+    }
+  }
+
+  peg$subclass(peg$SyntaxError, Error);
+
+  peg$SyntaxError.buildMessage = function(expected, found) {
+    var DESCRIBE_EXPECTATION_FNS = {
+          literal: function(expectation) {
+            return "\"" + literalEscape(expectation.text) + "\"";
+          },
+
+          "class": function(expectation) {
+            var escapedParts = "",
+                i;
+
+            for (i = 0; i < expectation.parts.length; i++) {
+              escapedParts += expectation.parts[i] instanceof Array
+                ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1])
+                : classEscape(expectation.parts[i]);
+            }
+
+            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+          },
+
+          any: function(expectation) {
+            return "any character";
+          },
+
+          end: function(expectation) {
+            return "end of input";
+          },
+
+          other: function(expectation) {
+            return expectation.description;
+          }
+        };
+
+    function hex(ch) {
+      return ch.charCodeAt(0).toString(16).toUpperCase();
+    }
+
+    function literalEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/"/g,  '\\"')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function classEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/\]/g, '\\]')
+        .replace(/\^/g, '\\^')
+        .replace(/-/g,  '\\-')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function describeExpectation(expectation) {
+      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+    }
+
+    function describeExpected(expected) {
+      var descriptions = new Array(expected.length),
+          i, j;
+
+      for (i = 0; i < expected.length; i++) {
+        descriptions[i] = describeExpectation(expected[i]);
+      }
+
+      descriptions.sort();
+
+      if (descriptions.length > 0) {
+        for (i = 1, j = 1; i < descriptions.length; i++) {
+          if (descriptions[i - 1] !== descriptions[i]) {
+            descriptions[j] = descriptions[i];
+            j++;
+          }
+        }
+        descriptions.length = j;
+      }
+
+      switch (descriptions.length) {
+        case 1:
+          return descriptions[0];
+
+        case 2:
+          return descriptions[0] + " or " + descriptions[1];
+
+        default:
+          return descriptions.slice(0, -1).join(", ")
+            + ", or "
+            + descriptions[descriptions.length - 1];
+      }
+    }
+
+    function describeFound(found) {
+      return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+    }
+
+    return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+  };
+
+  function peg$parse(input, options) {
+    options = options !== void 0 ? options : {};
+
+    var peg$FAILED = {},
+
+        peg$startRuleFunctions = { Expression: peg$parseExpression },
+        peg$startRuleFunction  = peg$parseExpression,
+
+        peg$c0 = "or",
+        peg$c1 = peg$literalExpectation("or", false),
+        peg$c2 = function(left, right) { return { type: 'or', left, right }; },
+        peg$c3 = "and",
+        peg$c4 = peg$literalExpectation("and", false),
+        peg$c5 = function(left, right) { return { type: 'and', left, right }; },
+        peg$c6 = "not",
+        peg$c7 = peg$literalExpectation("not", false),
+        peg$c8 = function(expr) { return { type: 'not', expr }; },
+        peg$c9 = "(",
+        peg$c10 = peg$literalExpectation("(", false),
+        peg$c11 = ")",
+        peg$c12 = peg$literalExpectation(")", false),
+        peg$c13 = function(expr) { return expr; },
+        peg$c14 = /^["]/,
+        peg$c15 = peg$classExpectation(["\""], false, false),
+        peg$c16 = /^[^"]/,
+        peg$c17 = peg$classExpectation(["\""], true, false),
+        peg$c18 = function() { return { type: 'keyword', value: text().slice(1, -1) }; },
+        peg$c19 = /^[']/,
+        peg$c20 = peg$classExpectation(["'"], false, false),
+        peg$c21 = /^[^']/,
+        peg$c22 = peg$classExpectation(["'"], true, false),
+        peg$c23 = /^[^ ()]/,
+        peg$c24 = peg$classExpectation([" ", "(", ")"], true, false),
+        peg$c25 = function() { return { type: 'keyword', value: text() }; },
+        peg$c26 = peg$otherExpectation("whitespace"),
+        peg$c27 = /^[ \t\n\r]/,
+        peg$c28 = peg$classExpectation([" ", "\t", "\n", "\r"], false, false),
+
+        peg$currPos          = 0,
+        peg$savedPos         = 0,
+        peg$posDetailsCache  = [{ line: 1, column: 1 }],
+        peg$maxFailPos       = 0,
+        peg$maxFailExpected  = [],
+        peg$silentFails      = 0,
+
+        peg$result;
+
+    if ("startRule" in options) {
+      if (!(options.startRule in peg$startRuleFunctions)) {
+        throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+      }
+
+      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+    }
+
+    function text() {
+      return input.substring(peg$savedPos, peg$currPos);
+    }
+
+    function location() {
+      return peg$computeLocation(peg$savedPos, peg$currPos);
+    }
+
+    function expected(description, location) {
+      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
+
+      throw peg$buildStructuredError(
+        [peg$otherExpectation(description)],
+        input.substring(peg$savedPos, peg$currPos),
+        location
+      );
+    }
+
+    function error(message, location) {
+      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
+
+      throw peg$buildSimpleError(message, location);
+    }
+
+    function peg$literalExpectation(text, ignoreCase) {
+      return { type: "literal", text: text, ignoreCase: ignoreCase };
+    }
+
+    function peg$classExpectation(parts, inverted, ignoreCase) {
+      return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+    }
+
+    function peg$anyExpectation() {
+      return { type: "any" };
+    }
+
+    function peg$endExpectation() {
+      return { type: "end" };
+    }
+
+    function peg$otherExpectation(description) {
+      return { type: "other", description: description };
+    }
+
+    function peg$computePosDetails(pos) {
+      var details = peg$posDetailsCache[pos], p;
+
+      if (details) {
+        return details;
+      } else {
+        p = pos - 1;
+        while (!peg$posDetailsCache[p]) {
+          p--;
+        }
+
+        details = peg$posDetailsCache[p];
+        details = {
+          line:   details.line,
+          column: details.column
+        };
+
+        while (p < pos) {
+          if (input.charCodeAt(p) === 10) {
+            details.line++;
+            details.column = 1;
+          } else {
+            details.column++;
+          }
+
+          p++;
+        }
+
+        peg$posDetailsCache[pos] = details;
+        return details;
+      }
+    }
+
+    function peg$computeLocation(startPos, endPos) {
+      var startPosDetails = peg$computePosDetails(startPos),
+          endPosDetails   = peg$computePosDetails(endPos);
+
+      return {
+        start: {
+          offset: startPos,
+          line:   startPosDetails.line,
+          column: startPosDetails.column
+        },
+        end: {
+          offset: endPos,
+          line:   endPosDetails.line,
+          column: endPosDetails.column
+        }
+      };
+    }
+
+    function peg$fail(expected) {
+      if (peg$currPos < peg$maxFailPos) { return; }
+
+      if (peg$currPos > peg$maxFailPos) {
+        peg$maxFailPos = peg$currPos;
+        peg$maxFailExpected = [];
+      }
+
+      peg$maxFailExpected.push(expected);
+    }
+
+    function peg$buildSimpleError(message, location) {
+      return new peg$SyntaxError(message, null, null, location);
+    }
+
+    function peg$buildStructuredError(expected, found, location) {
+      return new peg$SyntaxError(
+        peg$SyntaxError.buildMessage(expected, found),
+        expected,
+        found,
+        location
+      );
+    }
+
+    function peg$parseExpression() {
+      var s0;
+
+      s0 = peg$parseOr();
+
+      return s0;
+    }
+
+    function peg$parseOr() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parseAnd();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          if (input.substr(peg$currPos, 2) === peg$c0) {
+            s3 = peg$c0;
+            peg$currPos += 2;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c1); }
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseOr();
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c2(s1, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseAnd();
+      }
+
+      return s0;
+    }
+
+    function peg$parseAnd() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parseNot();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          if (input.substr(peg$currPos, 3) === peg$c3) {
+            s3 = peg$c3;
+            peg$currPos += 3;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c4); }
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseAnd();
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c5(s1, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseNot();
+      }
+
+      return s0;
+    }
+
+    function peg$parseNot() {
+      var s0, s1, s2, s3, s4;
+
+      s0 = peg$currPos;
+      s1 = peg$parse_();
+      if (s1 !== peg$FAILED) {
+        if (input.substr(peg$currPos, 3) === peg$c6) {
+          s2 = peg$c6;
+          peg$currPos += 3;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c7); }
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parse_();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parseFactor();
+            if (s4 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s1 = peg$c8(s4);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseFactor();
+      }
+
+      return s0;
+    }
+
+    function peg$parseFactor() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 40) {
+        s1 = peg$c9;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c10); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parse_();
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseOr();
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parse_();
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 41) {
+                s5 = peg$c11;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c12); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c13(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseKeyword1();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parseKeyword2();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseKeyword3();
+          }
+        }
+      }
+
+      return s0;
+    }
+
+    function peg$parseKeyword1() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      if (peg$c14.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c15); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c16.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c17); }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c16.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c17); }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          if (peg$c14.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c15); }
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c18();
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseKeyword2() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      if (peg$c19.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c20); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c21.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c22); }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c21.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c22); }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          if (peg$c19.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c20); }
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c18();
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseKeyword3() {
+      var s0, s1, s2;
+
+      s0 = peg$currPos;
+      s1 = [];
+      if (peg$c23.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c24); }
+      }
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (peg$c23.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c24); }
+        }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c25();
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parse_() {
+      var s0, s1;
+
+      peg$silentFails++;
+      s0 = [];
+      if (peg$c27.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c28); }
+      }
+      while (s1 !== peg$FAILED) {
+        s0.push(s1);
+        if (peg$c27.test(input.charAt(peg$currPos))) {
+          s1 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c28); }
+        }
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c26); }
+      }
+
+      return s0;
+    }
+
+    peg$result = peg$startRuleFunction();
+
+    if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+      return peg$result;
+    } else {
+      if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+        peg$fail(peg$endExpectation());
+      }
+
+      throw peg$buildStructuredError(
+        peg$maxFailExpected,
+        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+        peg$maxFailPos < input.length
+          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+      );
+    }
+  }
+
+  return {
+    SyntaxError: peg$SyntaxError,
+    parse:       peg$parse
+  };
+})();