A messy little js file that removes comments from any string passed into `stripComments(str)` function.

commentRemover.js

exports.stripComments = function stripComments(toBeStrippedStr){
//LEXER
  function Lexer () {
    this.setIndex = false;
    this.useNew = false;
    for (var i = 0; i < arguments.length; ++i) {
      var arg = arguments [i];
      if (arg === Lexer.USE_NEW) {
        this.useNew = true;
      }
      else if (arg === Lexer.SET_INDEX) {
        this.setIndex = Lexer.DEFAULT_INDEX;
      }
      else if (arg instanceof Lexer.SET_INDEX) {
        this.setIndex = arg.indexProp;
      }
    }
    this.rules = [];
    this.errorLexeme = null;
  }

  Lexer.NULL_LEXEME = {};

  Lexer.ERROR_LEXEME = { 
    toString: function () {
      return "[object Lexer.ERROR_LEXEME]";
    }
  };

  Lexer.DEFAULT_INDEX = "index";

  Lexer.USE_NEW = {};

  Lexer.SET_INDEX = function (indexProp) {
    if ( !(this instanceof arguments.callee)) {
      return new arguments.callee.apply (this, arguments);
    }
    if (indexProp === undefined) {
      indexProp = Lexer.DEFAULT_INDEX;
    }
    this.indexProp = indexProp;
  };

  (function () {
    var New = (function () {
      var fs = [];
      return function () {
        var f = fs [arguments.length];
        if (f) {
          return f.apply (this, arguments);
        }
        var argStrs = [];
        for (var i = 0; i < arguments.length; ++i) {
          argStrs.push ("a[" + i + "]");
        }
        f = new Function ("var a=arguments;return new this(" + argStrs.join () + ");");
        if (arguments.length < 100) {
          fs [arguments.length] = f;
        }
        return f.apply (this, arguments);
      };
    }) ();

    var flagMap = [
        ["global", "g"]
      , ["ignoreCase", "i"]
      , ["multiline", "m"]
      , ["sticky", "y"]
      ];

    function getFlags (regex) {
      var flags = "";
      for (var i = 0; i < flagMap.length; ++i) {
        if (regex [flagMap [i] [0]]) {
          flags += flagMap [i] [1];
        }
      }
      return flags;
    }

    function not (x) {
      return function (y) {
        return x !== y;
      };
    }

    function Rule (regex, lexeme) {
      if (!regex.global) {
        var flags = "g" + getFlags (regex);
        regex = new RegExp (regex.source, flags);
      }
      this.regex = regex;
      this.lexeme = lexeme;
    }

    Lexer.prototype = {
        constructor: Lexer
    
      , addRule: function (regex, lexeme) {
          var rule = new Rule (regex, lexeme);
          this.rules.push (rule);
        }

      , setErrorLexeme: function (lexeme) {
          this.errorLexeme = lexeme;
        }

      , runLexeme: function (lexeme, exec) {
          if (typeof lexeme !== "function") {
            return lexeme;
          }
          var args = exec.concat (exec.index, exec.input);
          if (this.useNew) {
            return New.apply (lexeme, args);
          }
          return lexeme.apply (null, args);
        }

      , lex: function (str) {
          var index = 0;
          var lexemes = [];
          if (this.setIndex) {
            lexemes.push = function () {
              for (var i = 0; i < arguments.length; ++i) {
                if (arguments [i]) {
                  arguments [i] [this.setIndex] = index;
                }
              }
              return Array.prototype.push.apply (this, arguments);
            };
          }
          while (index < str.length) {
            var bestExec = null;
            var bestRule = null;
            for (var i = 0; i < this.rules.length; ++i) {
              var rule = this.rules [i];
              rule.regex.lastIndex = index;
              var exec = rule.regex.exec (str);
              if (exec) {
                var doUpdate = !bestExec 
                  || (exec.index < bestExec.index)
                  || (exec.index === bestExec.index && exec [0].length > bestExec [0].length)
                  ;
                if (doUpdate) {
                  bestExec = exec;
                  bestRule = rule;
                }
              }
            }
            if (!bestExec) {
              if (this.errorLexeme) {
                lexemes.push (this.errorLexeme);
                return lexemes.filter (not (Lexer.NULL_LEXEME));
              }
              ++index;
            }
            else {
              if (this.errorLexeme && index !== bestExec.index) {
                lexemes.push (this.errorLexeme);
              }
              var lexeme = this.runLexeme (bestRule.lexeme, bestExec);
              lexemes.push (lexeme);
              index = bestRule.regex.lastIndex;
            }
          }
          return lexemes.filter (not (Lexer.NULL_LEXEME));
        }
    };
  }) ();

  if (!Array.prototype.filter) {
    Array.prototype.filter = function (fun) {
      var len = this.length >>> 0;
      var res = [];
      var thisp = arguments [1];
      for (var i = 0; i < len; ++i) {
        if (i in this) {
          var val = this [i];
          if (fun.call (thisp, val, i, this)) {
            res.push (val);
          }
        }
      }
      return res;
    };
  }

  Array.prototype.last = function () {
    return this [this.length - 1];
  };

  RegExp.prototype.getFlags = (function () {
    var flagMap = [
        ["global", "g"]
      , ["ignoreCase", "i"]
      , ["multiline", "m"]
      , ["sticky", "y"]
      ];

    return  function () {
      var flags = "";
      for (var i = 0; i < flagMap.length; ++i) {
        if (this [flagMap [i] [0]]) {
          flags += flagMap [i] [1];
        }
      }
      return flags;
    };
  }) ();

  RegExp.concat = function (/*r1, r2, ..., rN [, flagMerger] */) {
    var regexes = Array.prototype.slice.call (arguments);
    var regexStr = "";
    var flags = (regexes [0].getFlags && regexes [0].getFlags ()) || "";
    var flagMerger = RegExp.concat.INTERSECT_FLAGS;
    if (typeof regexes.last () === "function") {
      flagMerger = regexes.pop ();
    }
    for (var j = 0; j < regexes.length; ++j) {
      var regex = regexes [j];
      if (typeof regex === "string") {
        flags = flagMerger (flags, "");
        regexStr += regex;
      }
      else {
        flags = flagMerger (flags, regex.getFlags ());
        regexStr += regex.source;
      }
    }
    return new RegExp (regexStr, flags);
  };

  (function () {
    function setToString (set) {
      var str = "";
      for (var prop in set) {
        if (set.hasOwnProperty (prop) && set [prop]) {
          str += prop;
        }
      }
      return str;
    }
    
    function toSet (str) {
      var set = {};
      for (var i = 0; i < str.length; ++i) {
        set [str.charAt (i)] = true;
      }
      return set;
    }

    function union (set1, set2) {
      for (var prop in set2) {
        if (set2.hasOwnProperty (prop)) {
          set1 [prop] = true;
        }
      }
      return set1;
    }

    function intersect (set1, set2) {
      for (var prop in set2) {
        if (set2.hasOwnProperty (prop) && !set2 [prop]) {
          delete set1 [prop];
        }
      }
      return set1;
    }

    RegExp.concat.UNION_FLAGS = function (flags1, flags2) {
      return setToString (union (toSet (flags1), toSet (flags2)));
    }
    
    RegExp.concat.INTERSECT_FLAGS = function (flags1, flags2) {
      return setToString (intersect (toSet (flags1), toSet (flags2)));
    };
    
  }) ();

  RegExp.prototype.group = function () {
    return RegExp.concat ("(?:", this, ")", RegExp.concat.UNION_FLAGS);
  };
    
  RegExp.prototype.optional = function () {
    return RegExp.concat (this.group (), "?", RegExp.concat.UNION_FLAGS);
  };

  RegExp.prototype.or = function (regex) {
    return RegExp.concat (this, "|", regex, RegExp.concat.UNION_FLAGS).group ();
  };

  RegExp.prototype.many = function () {
    return RegExp.concat (this.group (), "*", RegExp.concat.UNION_FLAGS);
  };

  RegExp.prototype.many1 = function () {
    return RegExp.concat (this.group (), "+", RegExp.concat.UNION_FLAGS);
  };

  function id (x) {
    return x;
  }

  /*************************************************************************************/

  var eof = /(?![\S\s])/m;
  var newline = /\r?\n/m;
  var spaces = /[\t ]*/m;
  var leadingSpaces = RegExp.concat (/^/m, spaces);
  var trailingSpaces = RegExp.concat (spaces, /$/m);

  var lineComment = /\/\/(?!@).*/m;
  var blockComment = /\/\*(?!@)(?:[^*]|\*[^/])*\*\//m;
  var comment = lineComment .or (blockComment);
  var comments = RegExp.concat (comment, RegExp.concat (spaces, comment).many ());
  var eofComments = RegExp.concat (leadingSpaces, comments, trailingSpaces, eof);
  var entireLineComments = RegExp.concat (leadingSpaces, comments, trailingSpaces, newline);

  var lineCondComp = /\/\/@.*/;
  var blockCondComp = /\/\*@(?:[^*]|\*[^@]|\*@[^/])*@*\*\//;

  var doubleQuotedString = /"(?:[^\\"]|\\.)*"/;
  var singleQuotedString = /'(?:[^\\']|\\.)*'/;

  var regexLiteral = /\/(?![/*])(?:[^/\\[]|\\.|\[(?:[^\]\\]|\\.)*\])*\//;

  var anyChar = /[\S\s]/;

  /*************************************************************************************/

  
  var stripper = new Lexer ();

  stripper.addRule (entireLineComments, Lexer.NULL_LEXEME);

  stripper.addRule (
      RegExp.concat (newline, entireLineComments.many (), eofComments)
    , Lexer.NULL_LEXEME
  );

  stripper.addRule (
      RegExp.concat (comment, RegExp.concat (trailingSpaces, newline, eofComments).optional ())
    , Lexer.NULL_LEXEME
  );

  stripper.addRule (lineCondComp, id);
  stripper.addRule (blockCondComp, id);

  stripper.addRule (doubleQuotedString, id);
  stripper.addRule (singleQuotedString, id);

  stripper.addRule (regexLiteral, id);

  stripper.addRule (anyChar, id);

  /*************************************************************************************/

  return stripper.lex(toBeStrippedStr).join ("");
}

index.js

var strWITHComments = " Any string with comments; ///here is some randome text  \
//blablba                                                                       \
code;                                                                           \
/*A comment like this should not be here. */                                    \
some more code; ";


var CommentRemover = require('./commentRemover.js')
var strWithoutComments = CommentRemover.stripComments(strWITHComments);
console.log(strWithoutComments)