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These are\n// here to avoid re-instantiating the RegExp objects if `Autolinker.link()` is\n// called multiple times, thus instantiating MentionMatcher and its RegExp \n// objects each time (which is very expensive - see https://github.com/gregjacobs/Autolinker.js/issues/314). \n// See descriptions of the properties where they are used for details about them\nconst twitterRegex = new RegExp( `@[_${alphaNumericAndMarksCharsStr}]{1,50}(?![_${alphaNumericAndMarksCharsStr}])`, 'g' );  // lookahead used to make sure we don't match something above 50 characters\nconst instagramRegex = new RegExp( `@[_.${alphaNumericAndMarksCharsStr}]{1,30}(?![_${alphaNumericAndMarksCharsStr}])`, 'g' );  // lookahead used to make sure we don't match something above 30 characters\nconst soundcloudRegex = new RegExp( `@[-_.${alphaNumericAndMarksCharsStr}]{1,50}(?![-_${alphaNumericAndMarksCharsStr}])`, 'g' );  // lookahead used to make sure we don't match something above 50 characters\nconst nonWordCharRegex = new RegExp( '[^' + alphaNumericAndMarksCharsStr + ']' );\n\n/**\n * @class Autolinker.matcher.Mention\n * @extends Autolinker.matcher.Matcher\n *\n * Matcher to find/replace username matches in an input string.\n */\nexport class MentionMatcher extends Matcher {\n\n\t/**\n\t * @cfg {'twitter'/'instagram'/'soundcloud'} protected\n\t * \n\t * The name of service to link @mentions to.\n\t * \n\t * Valid values are: 'twitter', 'instagram', or 'soundcloud'\n\t */\n\tprotected serviceName: MentionServices = 'twitter';  // default value just to get the above doc comment in the ES5 output and documentation generator\n\n\t/**\n\t * Hash of regular expression to match username handles. Example match:\n\t *\n\t *     @asdf\n\t *\n\t * @private\n\t * @property {Object} matcherRegexes\n\t */\n\tprotected readonly matcherRegexes: {[key: string]: RegExp} = {\n\t\t'twitter': twitterRegex,\n\t\t'instagram': instagramRegex,\n\t\t'soundcloud': soundcloudRegex\n\t};\n\n\t/**\n\t * The regular expression to use to check the character before a username match to\n\t * make sure we didn't accidentally match an email address.\n\t *\n\t * For example, the string \"asdf@asdf.com\" should not match \"@asdf\" as a username.\n\t *\n\t * @private\n\t * @property {RegExp} nonWordCharRegex\n\t */\n\tprotected readonly nonWordCharRegex = nonWordCharRegex;\n\n\n\t/**\n\t * @method constructor\n\t * @param {Object} cfg The configuration properties for the Match instance,\n\t *   specified in an Object (map).\n\t */\n\tconstructor( cfg: MentionMatcherConfig ) {\n\t\tsuper( cfg );\n\n\t\tthis.serviceName = cfg.serviceName;\n\t}\n\n\n\t/**\n\t * @inheritdoc\n\t */\n\tparseMatches( text: string ) {\n\t\tlet serviceName = this.serviceName,\n\t\t    matcherRegex = this.matcherRegexes[ this.serviceName ],\n\t\t    nonWordCharRegex = this.nonWordCharRegex,\n\t\t    tagBuilder = this.tagBuilder,\n\t\t    matches: Match[] = [],\n\t\t    match: RegExpExecArray | null;\n\n\t\tif (!matcherRegex) {\n\t\t\treturn matches;\n\t\t}\n\n\t\twhile( ( match = matcherRegex.exec( text ) ) !== null ) {\n\t\t\tlet offset = match.index,\n\t\t\t    prevChar = text.charAt( offset - 1 );\n\n\t\t\t// If we found the match at the beginning of the string, or we found the match\n\t\t\t// and there is a whitespace char in front of it (meaning it is not an email\n\t\t\t// address), then it is a username match.\n\t\t\tif( offset === 0 || nonWordCharRegex.test( prevChar ) ) {\n\t\t\t\tlet matchedText = match[ 0 ].replace( /\\.+$/g, '' ), // strip off trailing .\n\t\t\t\t    mention = matchedText.slice( 1 );  // strip off the '@' character at the beginning\n\n\t\t\t\tmatches.push( new MentionMatch( {\n\t\t\t\t\ttagBuilder    : tagBuilder,\n\t\t\t\t\tmatchedText   : matchedText,\n\t\t\t\t\toffset        : offset,\n\t\t\t\t\tserviceName   : serviceName,\n\t\t\t\t\tmention       : mention\n\t\t\t\t} ) );\n\t\t\t}\n\t\t}\n\n\t\treturn matches;\n\t}\n\n}\n\n\nexport interface MentionMatcherConfig extends MatcherConfig {\n\tserviceName: MentionServices\n}"]}