Replace nonalphanumeric on textfield with regex, javascript

Sure, regex is fully available to you in Unityscript.

just add this at the top

 import System.Text.RegularExpressions;

here's all the doco

http://msdn.microsoft.com/en-us/library/hs600312.aspx

here's some random sample code that uses regex in Unityscript

 function _preBraces()
 {
 // work on the WHOLE file at once.
 
 var rgx:Regex;
 
 rgx = new Regex("(\n|\r|\f)+");
 allText = rgx.Replace(allText, "\n"); // unit tested 9/2012 hooray !
 
 var repeatChunk:String;        // is large
 var repsText:String;
 
 // var pattern = "\\{(\\d+)\n((\n|.)+?)\\}";    // no nesting
    var pattern = "\\{(\\d+)\n((\n|[^{])+?)\\}";    // handles nesting!
 
 rgx = new Regex( pattern );
 
 while ( rgx.IsMatch( allText ) )
     {
     // swapping out one repeat area...
     
     var mmm:Match;
     mmm = rgx.Match(allText);
     var passage:String;
     passage = mmm.Value;
     
     var veryLongChunk:String;
     veryLongChunk = _expandOneRepeater(passage);
     
     allText = rgx.Replace( allText, veryLongChunk, 1 );
     }
 
 rgx = new Regex("(\n|\r|\f)+");
 allText = rgx.Replace(allText, "\n");
 }

Please note (for any future readers). Mastering writing regular expressions is beyond the scope of this forum. For questions specifically about specific regex (like "how to change this to that") try a forum like stackoverflow.