Github user LukaszRacon commented on the pull request:

    https://github.com/apache/struts/pull/56#issuecomment-156139393
  
    I updated PR with a shorter literal regexp notation.
    
    `"/regexString/i"` will not work since it would be converted by str.match 
function to RegExp object
    `new RegExp("/regexString/i")` while we need RegExp with a case-insensitive 
flag: `new RegExp("regexString", "i")`
    
    So in this case we could use:
    ```
    fieldValue.match(new RegExp("${validator.regex?js_string}", "i"))==null
    ```
    or shorter version:
    ```
    fieldValue.match(/${validator.regex}/i)==null
    ```
    I also fixed url validation that used incorrect RegExp. 


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