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Editing: XRegExp.js
// XRegExp 1.5.1 // (c) 2007-2012 Steven Levithan // MIT License // <http://xregexp.com> // Provides an augmented, extensible, cross-browser implementation of regular expressions, // including support for additional syntax, flags, and methods var XRegExp; if (XRegExp) { // Avoid running twice, since that would break references to native globals throw Error("can't load XRegExp twice in the same frame"); } // Run within an anonymous function to protect variables and avoid new globals (function (undefined) { //--------------------------------- // Constructor //--------------------------------- // Accepts a pattern and flags; returns a new, extended `RegExp` object. Differs from a native // regular expression in that additional syntax and flags are supported and cross-browser // syntax inconsistencies are ameliorated. `XRegExp(/regex/)` clones an existing regex and // converts to type XRegExp XRegExp = function (pattern, flags) { var output = [], currScope = XRegExp.OUTSIDE_CLASS, pos = 0, context, tokenResult, match, chr, regex; if (XRegExp.isRegExp(pattern)) { if (flags !== undefined) throw TypeError("can't supply flags when constructing one RegExp from another"); return clone(pattern); } // Tokens become part of the regex construction process, so protect against infinite // recursion when an XRegExp is constructed within a token handler or trigger if (isInsideConstructor) throw Error("can't call the XRegExp constructor within token definition functions"); flags = flags || ""; context = { // `this` object for custom tokens hasNamedCapture: false, captureNames: [], hasFlag: function (flag) {return flags.indexOf(flag) > -1;}, setFlag: function (flag) {flags += flag;} }; while (pos < pattern.length) { // Check for custom tokens at the current position tokenResult = runTokens(pattern, pos, currScope, context); if (tokenResult) { output.push(tokenResult.output); pos += (tokenResult.match[0].length || 1); } else { // Check for native multicharacter metasequences (excluding character classes) at // the current position if (match = nativ.exec.call(nativeTokens[currScope], pattern.slice(pos))) { output.push(match[0]); pos += match[0].length; } else { chr = pattern.charAt(pos); if (chr === "[") currScope = XRegExp.INSIDE_CLASS; else if (chr === "]") currScope = XRegExp.OUTSIDE_CLASS; // Advance position one character output.push(chr); pos++; } } } regex = RegExp(output.join(""), nativ.replace.call(flags, flagClip, "")); regex._xregexp = { source: pattern, captureNames: context.hasNamedCapture ? context.captureNames : null }; return regex; }; //--------------------------------- // Public properties //--------------------------------- XRegExp.version = "1.5.1"; // Token scope bitflags XRegExp.INSIDE_CLASS = 1; XRegExp.OUTSIDE_CLASS = 2; //--------------------------------- // Private variables //--------------------------------- var replacementToken = /\$(?:(\d\d?|[$&`'])|{([$\w]+)})/g, flagClip = /[^gimy]+|([\s\S])(?=[\s\S]*\1)/g, // Nonnative and duplicate flags quantifier = /^(?:[?*+]|{\d+(?:,\d*)?})\??/, isInsideConstructor = false, tokens = [], // Copy native globals for reference ("native" is an ES3 reserved keyword) nativ = { exec: RegExp.prototype.exec, test: RegExp.prototype.test, match: String.prototype.match, replace: String.prototype.replace, split: String.prototype.split }, compliantExecNpcg = nativ.exec.call(/()??/, "")[1] === undefined, // check `exec` handling of nonparticipating capturing groups compliantLastIndexIncrement = function () { var x = /^/g; nativ.test.call(x, ""); return !x.lastIndex; }(), hasNativeY = RegExp.prototype.sticky !== undefined, nativeTokens = {}; // `nativeTokens` match native multicharacter metasequences only (including deprecated octals, // excluding character classes) nativeTokens[XRegExp.INSIDE_CLASS] = /^(?:\\(?:[0-3][0-7]{0,2}|[4-7][0-7]?|x[\dA-Fa-f]{2}|u[\dA-Fa-f]{4}|c[A-Za-z]|[\s\S]))/; nativeTokens[XRegExp.OUTSIDE_CLASS] = /^(?:\\(?:0(?:[0-3][0-7]{0,2}|[4-7][0-7]?)?|[1-9]\d*|x[\dA-Fa-f]{2}|u[\dA-Fa-f]{4}|c[A-Za-z]|[\s\S])|\(\?[:=!]|[?*+]\?|{\d+(?:,\d*)?}\??)/; //--------------------------------- // Public methods //--------------------------------- // Lets you extend or change XRegExp syntax and create custom flags. This is used internally by // the XRegExp library and can be used to create XRegExp plugins. This function is intended for // users with advanced knowledge of JavaScript's regular expression syntax and behavior. It can // be disabled by `XRegExp.freezeTokens` XRegExp.addToken = function (regex, handler, scope, trigger) { tokens.push({ pattern: clone(regex, "g" + (hasNativeY ? "y" : "")), handler: handler, scope: scope || XRegExp.OUTSIDE_CLASS, trigger: trigger || null }); }; // Accepts a pattern and flags; returns an extended `RegExp` object. If the pattern and flag // combination has previously been cached, the cached copy is returned; otherwise the newly // created regex is cached XRegExp.cache = function (pattern, flags) { var key = pattern + "/" + (flags || ""); return XRegExp.cache[key] || (XRegExp.cache[key] = XRegExp(pattern, flags)); }; // Accepts a `RegExp` instance; returns a copy with the `/g` flag set. The copy has a fresh // `lastIndex` (set to zero). If you want to copy a regex without forcing the `global` // property, use `XRegExp(regex)`. Do not use `RegExp(regex)` because it will not preserve // special properties required for named capture XRegExp.copyAsGlobal = function (regex) { return clone(regex, "g"); }; // Accepts a string; returns the string with regex metacharacters escaped. The returned string // can safely be used at any point within a regex to match the provided literal string. Escaped // characters are [ ] { } ( ) * + ? - . , \ ^ $ | # and whitespace XRegExp.escape = function (str) { return str.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&"); }; // Accepts a string to search, regex to search with, position to start the search within the // string (default: 0), and an optional Boolean indicating whether matches must start at-or- // after the position or at the specified position only. This function ignores the `lastIndex` // of the provided regex in its own handling, but updates the property for compatibility XRegExp.execAt = function (str, regex, pos, anchored) { var r2 = clone(regex, "g" + ((anchored && hasNativeY) ? "y" : "")), match; r2.lastIndex = pos = pos || 0; match = r2.exec(str); // Run the altered `exec` (required for `lastIndex` fix, etc.) if (anchored && match && match.index !== pos) match = null; if (regex.global) regex.lastIndex = match ? r2.lastIndex : 0; return match; }; // Breaks the unrestorable link to XRegExp's private list of tokens, thereby preventing // syntax and flag changes. Should be run after XRegExp and any plugins are loaded XRegExp.freezeTokens = function () { XRegExp.addToken = function () { throw Error("can't run addToken after freezeTokens"); }; }; // Accepts any value; returns a Boolean indicating whether the argument is a `RegExp` object. // Note that this is also `true` for regex literals and regexes created by the `XRegExp` // constructor. This works correctly for variables created in another frame, when `instanceof` // and `constructor` checks would fail to work as intended XRegExp.isRegExp = function (o) { return Object.prototype.toString.call(o) === "[object RegExp]"; }; // Executes `callback` once per match within `str`. Provides a simpler and cleaner way to // iterate over regex matches compared to the traditional approaches of subverting // `String.prototype.replace` or repeatedly calling `exec` within a `while` loop XRegExp.iterate = function (str, regex, callback, context) { var r2 = clone(regex, "g"), i = -1, match; while (match = r2.exec(str)) { // Run the altered `exec` (required for `lastIndex` fix, etc.) if (regex.global) regex.lastIndex = r2.lastIndex; // Doing this to follow expectations if `lastIndex` is checked within `callback` callback.call(context, match, ++i, str, regex); if (r2.lastIndex === match.index) r2.lastIndex++; } if (regex.global) regex.lastIndex = 0; }; // Accepts a string and an array of regexes; returns the result of using each successive regex // to search within the matches of the previous regex. The array of regexes can also contain // objects with `regex` and `backref` properties, in which case the named or numbered back- // references specified are passed forward to the next regex or returned. E.g.: // var xregexpImgFileNames = XRegExp.matchChain(html, [ // {regex: /<img\b([^>]+)>/i, backref: 1}, // <img> tag attributes // {regex: XRegExp('(?ix) \\s src=" (?<src> [^"]+ )'), backref: "src"}, // src attribute values // {regex: XRegExp("^http://xregexp\\.com(/[^#?]+)", "i"), backref: 1}, // xregexp.com paths // /[^\/]+$/ // filenames (strip directory paths) // ]); XRegExp.matchChain = function (str, chain) { return function recurseChain (values, level) { var item = chain[level].regex ? chain[level] : {regex: chain[level]}, regex = clone(item.regex, "g"), matches = [], i; for (i = 0; i < values.length; i++) { XRegExp.iterate(values[i], regex, function (match) { matches.push(item.backref ? (match[item.backref] || "") : match[0]); }); } return ((level === chain.length - 1) || !matches.length) ? matches : recurseChain(matches, level + 1); }([str], 0); }; //--------------------------------- // New RegExp prototype methods //--------------------------------- // Accepts a context object and arguments array; returns the result of calling `exec` with the // first value in the arguments array. the context is ignored but is accepted for congruity // with `Function.prototype.apply` RegExp.prototype.apply = function (context, args) { return this.exec(args[0]); }; // Accepts a context object and string; returns the result of calling `exec` with the provided // string. the context is ignored but is accepted for congruity with `Function.prototype.call` RegExp.prototype.call = function (context, str) { return this.exec(str); }; //--------------------------------- // Overridden native methods //--------------------------------- // Adds named capture support (with backreferences returned as `result.name`), and fixes two // cross-browser issues per ES3: // - Captured values for nonparticipating capturing groups should be returned as `undefined`, // rather than the empty string. // - `lastIndex` should not be incremented after zero-length matches. RegExp.prototype.exec = function (str) { var match, name, r2, origLastIndex; if (!this.global) origLastIndex = this.lastIndex; match = nativ.exec.apply(this, arguments); if (match) { // Fix browsers whose `exec` methods don't consistently return `undefined` for // nonparticipating capturing groups if (!compliantExecNpcg && match.length > 1 && indexOf(match, "") > -1) { r2 = RegExp(this.source, nativ.replace.call(getNativeFlags(this), "g", "")); // Using `str.slice(match.index)` rather than `match[0]` in case lookahead allowed // matching due to characters outside the match nativ.replace.call((str + "").slice(match.index), r2, function () { for (var i = 1; i < arguments.length - 2; i++) { if (arguments[i] === undefined) match[i] = undefined; } }); } // Attach named capture properties if (this._xregexp && this._xregexp.captureNames) { for (var i = 1; i < match.length; i++) { name = this._xregexp.captureNames[i - 1]; if (name) match[name] = match[i]; } } // Fix browsers that increment `lastIndex` after zero-length matches if (!compliantLastIndexIncrement && this.global && !match[0].length && (this.lastIndex > match.index)) this.lastIndex--; } if (!this.global) this.lastIndex = origLastIndex; // Fix IE, Opera bug (last tested IE 9.0.5, Opera 11.61 on Windows) return match; }; // Fix browser bugs in native method RegExp.prototype.test = function (str) { // Use the native `exec` to skip some processing overhead, even though the altered // `exec` would take care of the `lastIndex` fixes var match, origLastIndex; if (!this.global) origLastIndex = this.lastIndex; match = nativ.exec.call(this, str); // Fix browsers that increment `lastIndex` after zero-length matches if (match && !compliantLastIndexIncrement && this.global && !match[0].length && (this.lastIndex > match.index)) this.lastIndex--; if (!this.global) this.lastIndex = origLastIndex; // Fix IE, Opera bug (last tested IE 9.0.5, Opera 11.61 on Windows) return !!match; }; // Adds named capture support and fixes browser bugs in native method String.prototype.match = function (regex) { if (!XRegExp.isRegExp(regex)) regex = RegExp(regex); // Native `RegExp` if (regex.global) { var result = nativ.match.apply(this, arguments); regex.lastIndex = 0; // Fix IE bug return result; } return regex.exec(this); // Run the altered `exec` }; // Adds support for `${n}` tokens for named and numbered backreferences in replacement text, // and provides named backreferences to replacement functions as `arguments[0].name`. Also // fixes cross-browser differences in replacement text syntax when performing a replacement // using a nonregex search value, and the value of replacement regexes' `lastIndex` property // during replacement iterations. Note that this doesn't support SpiderMonkey's proprietary // third (`flags`) parameter String.prototype.replace = function (search, replacement) { var isRegex = XRegExp.isRegExp(search), captureNames, result, str, origLastIndex; // There are too many combinations of search/replacement types/values and browser bugs that // preclude passing to native `replace`, so don't try //if (...) // return nativ.replace.apply(this, arguments); if (isRegex) { if (search._xregexp) captureNames = search._xregexp.captureNames; // Array or `null` if (!search.global) origLastIndex = search.lastIndex; } else { search = search + ""; // Type conversion } if (Object.prototype.toString.call(replacement) === "[object Function]") { result = nativ.replace.call(this + "", search, function () { if (captureNames) { // Change the `arguments[0]` string primitive to a String object which can store properties arguments[0] = new String(arguments[0]); // Store named backreferences on `arguments[0]` for (var i = 0; i < captureNames.length; i++) { if (captureNames[i]) arguments[0][captureNames[i]] = arguments[i + 1]; } } // Update `lastIndex` before calling `replacement` (fix browsers) if (isRegex && search.global) search.lastIndex = arguments[arguments.length - 2] + arguments[0].length; return replacement.apply(null, arguments); }); } else { str = this + ""; // Type conversion, so `args[args.length - 1]` will be a string (given nonstring `this`) result = nativ.replace.call(str, search, function () { var args = arguments; // Keep this function's `arguments` available through closure return nativ.replace.call(replacement + "", replacementToken, function ($0, $1, $2) { // Numbered backreference (without delimiters) or special variable if ($1) { switch ($1) { case "$": return "$"; case "&": return args[0]; case "`": return args[args.length - 1].slice(0, args[args.length - 2]); case "'": return args[args.length - 1].slice(args[args.length - 2] + args[0].length); // Numbered backreference default: // What does "$10" mean? // - Backreference 10, if 10 or more capturing groups exist // - Backreference 1 followed by "0", if 1-9 capturing groups exist // - Otherwise, it's the string "$10" // Also note: // - Backreferences cannot be more than two digits (enforced by `replacementToken`) // - "$01" is equivalent to "$1" if a capturing group exists, otherwise it's the string "$01" // - There is no "$0" token ("$&" is the entire match) var literalNumbers = ""; $1 = +$1; // Type conversion; drop leading zero if (!$1) // `$1` was "0" or "00" return $0; while ($1 > args.length - 3) { literalNumbers = String.prototype.slice.call($1, -1) + literalNumbers; $1 = Math.floor($1 / 10); // Drop the last digit } return ($1 ? args[$1] || "" : "$") + literalNumbers; } // Named backreference or delimited numbered backreference } else { // What does "${n}" mean? // - Backreference to numbered capture n. Two differences from "$n": // - n can be more than two digits // - Backreference 0 is allowed, and is the entire match // - Backreference to named capture n, if it exists and is not a number overridden by numbered capture // - Otherwise, it's the string "${n}" var n = +$2; // Type conversion; drop leading zeros if (n <= args.length - 3) return args[n]; n = captureNames ? indexOf(captureNames, $2) : -1; return n > -1 ? args[n + 1] : $0; } }); }); } if (isRegex) { if (search.global) search.lastIndex = 0; // Fix IE, Safari bug (last tested IE 9.0.5, Safari 5.1.2 on Windows) else search.lastIndex = origLastIndex; // Fix IE, Opera bug (last tested IE 9.0.5, Opera 11.61 on Windows) } return result; }; // A consistent cross-browser, ES3 compliant `split` String.prototype.split = function (s /* separator */, limit) { // If separator `s` is not a regex, use the native `split` if (!XRegExp.isRegExp(s)) return nativ.split.apply(this, arguments); var str = this + "", // Type conversion output = [], lastLastIndex = 0, match, lastLength; // Behavior for `limit`: if it's... // - `undefined`: No limit // - `NaN` or zero: Return an empty array // - A positive number: Use `Math.floor(limit)` // - A negative number: No limit // - Other: Type-convert, then use the above rules if (limit === undefined || +limit < 0) { limit = Infinity; } else { limit = Math.floor(+limit); if (!limit) return []; } // This is required if not `s.global`, and it avoids needing to set `s.lastIndex` to zero // and restore it to its original value when we're done using the regex s = XRegExp.copyAsGlobal(s); while (match = s.exec(str)) { // Run the altered `exec` (required for `lastIndex` fix, etc.) if (s.lastIndex > lastLastIndex) { output.push(str.slice(lastLastIndex, match.index)); if (match.length > 1 && match.index < str.length) Array.prototype.push.apply(output, match.slice(1)); lastLength = match[0].length; lastLastIndex = s.lastIndex; if (output.length >= limit) break; } if (s.lastIndex === match.index) s.lastIndex++; } if (lastLastIndex === str.length) { if (!nativ.test.call(s, "") || lastLength) output.push(""); } else { output.push(str.slice(lastLastIndex)); } return output.length > limit ? output.slice(0, limit) : output; }; //--------------------------------- // Private helper functions //--------------------------------- // Supporting function for `XRegExp`, `XRegExp.copyAsGlobal`, etc. Returns a copy of a `RegExp` // instance with a fresh `lastIndex` (set to zero), preserving properties required for named // capture. Also allows adding new flags in the process of copying the regex function clone (regex, additionalFlags) { if (!XRegExp.isRegExp(regex)) throw TypeError("type RegExp expected"); var x = regex._xregexp; regex = XRegExp(regex.source, getNativeFlags(regex) + (additionalFlags || "")); if (x) { regex._xregexp = { source: x.source, captureNames: x.captureNames ? x.captureNames.slice(0) : null }; } return regex; } function getNativeFlags (regex) { return (regex.global ? "g" : "") + (regex.ignoreCase ? "i" : "") + (regex.multiline ? "m" : "") + (regex.extended ? "x" : "") + // Proposed for ES4; included in AS3 (regex.sticky ? "y" : ""); } function runTokens (pattern, index, scope, context) { var i = tokens.length, result, match, t; // Protect against constructing XRegExps within token handler and trigger functions isInsideConstructor = true; // Must reset `isInsideConstructor`, even if a `trigger` or `handler` throws try { while (i--) { // Run in reverse order t = tokens[i]; if ((scope & t.scope) && (!t.trigger || t.trigger.call(context))) { t.pattern.lastIndex = index; match = t.pattern.exec(pattern); // Running the altered `exec` here allows use of named backreferences, etc. if (match && match.index === index) { result = { output: t.handler.call(context, match, scope), match: match }; break; } } } } catch (err) { throw err; } finally { isInsideConstructor = false; } return result; } function indexOf (array, item, from) { if (Array.prototype.indexOf) // Use the native array method if available return array.indexOf(item, from); for (var i = from || 0; i < array.length; i++) { if (array[i] === item) return i; } return -1; } //--------------------------------- // Built-in tokens //--------------------------------- // Augment XRegExp's regular expression syntax and flags. Note that when adding tokens, the // third (`scope`) argument defaults to `XRegExp.OUTSIDE_CLASS` // Comment pattern: (?# ) XRegExp.addToken( /\(\?#[^)]*\)/, function (match) { // Keep tokens separated unless the following token is a quantifier return nativ.test.call(quantifier, match.input.slice(match.index + match[0].length)) ? "" : "(?:)"; } ); // Capturing group (match the opening parenthesis only). // Required for support of named capturing groups XRegExp.addToken( /\((?!\?)/, function () { this.captureNames.push(null); return "("; } ); // Named capturing group (match the opening delimiter only): (?<name> XRegExp.addToken( /\(\?<([$\w]+)>/, function (match) { this.captureNames.push(match[1]); this.hasNamedCapture = true; return "("; } ); // Named backreference: \k<name> XRegExp.addToken( /\\k<([\w$]+)>/, function (match) { var index = indexOf(this.captureNames, match[1]); // Keep backreferences separate from subsequent literal numbers. Preserve back- // references to named groups that are undefined at this point as literal strings return index > -1 ? "\\" + (index + 1) + (isNaN(match.input.charAt(match.index + match[0].length)) ? "" : "(?:)") : match[0]; } ); // Empty character class: [] or [^] XRegExp.addToken( /\[\^?]/, function (match) { // For cross-browser compatibility with ES3, convert [] to \b\B and [^] to [\s\S]. // (?!) should work like \b\B, but is unreliable in Firefox return match[0] === "[]" ? "\\b\\B" : "[\\s\\S]"; } ); // Mode modifier at the start of the pattern only, with any combination of flags imsx: (?imsx) // Does not support x(?i), (?-i), (?i-m), (?i: ), (?i)(?m), etc. XRegExp.addToken( /^\(\?([imsx]+)\)/, function (match) { this.setFlag(match[1]); return ""; } ); // Whitespace and comments, in free-spacing (aka extended) mode only XRegExp.addToken( /(?:\s+|#.*)+/, function (match) { // Keep tokens separated unless the following token is a quantifier return nativ.test.call(quantifier, match.input.slice(match.index + match[0].length)) ? "" : "(?:)"; }, XRegExp.OUTSIDE_CLASS, function () {return this.hasFlag("x");} ); // Dot, in dotall (aka singleline) mode only XRegExp.addToken( /\./, function () {return "[\\s\\S]";}, XRegExp.OUTSIDE_CLASS, function () {return this.hasFlag("s");} ); //--------------------------------- // Backward compatibility //--------------------------------- // Uncomment the following block for compatibility with XRegExp 1.0-1.2: /* XRegExp.matchWithinChain = XRegExp.matchChain; RegExp.prototype.addFlags = function (s) {return clone(this, s);}; RegExp.prototype.execAll = function (s) {var r = []; XRegExp.iterate(s, this, function (m) {r.push(m);}); return r;}; RegExp.prototype.forEachExec = function (s, f, c) {return XRegExp.iterate(s, this, f, c);}; RegExp.prototype.validate = function (s) {var r = RegExp("^(?:" + this.source + ")$(?!\\s)", getNativeFlags(this)); if (this.global) this.lastIndex = 0; return s.search(r) === 0;}; */ })();
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