Question

147

javascript syntax error: invalid regular expression

rated 0 times [ 154] [ 7] / answers: 1 / hits: 64054 / 11 Years ago, tue, april 23, 2013, 12:00:00

I am writing an application in javascript. In my application there is an option to search for a string/regex. The problem is match returns javascript error if user types wrong value.
Sample code:

  function myFunction() {

      var filter = $(#text_id).val();

      var query = select * from table;

      var found;

      if (query.match(filter) != -1) {

        found = true;

      } 

      else{

        found = false;

      }

       //Do something

    }

jsfiddle: http://jsfiddle.net/ZVNMq/

Enter the string: sel/

Match returns js error - Uncaught SyntaxError: Invalid regular expression: /sel/: at end of pattern.

Is there any way to check whether the string is valid regex or not?

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antoinette

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2 Years ago

answered 11 Years ago cruzs · Accepted Answer

Use a try-catch statement:

function myFunction() {

    var filter = $(#text_id).val();

    var query = select * from table;

    try {

        var regex = new RegExp(filter);

    } catch(e) {

        alert(e);

        return false;

    }

    var found = regex.test(query);

}