CODEWITHSUNDEEP
javascriptangularjsregexng-patternangularjs-ng-pattern
Nicolas Gehlert
Nicolas Gehlert

Reputation: 3253

Ng-Pattern performance issue with multiline regex

I have performance problems with ng-pattern on a textarea input.

I have a Regex expression to simply check if the code contains script, image or iframe tag. If I paste a script with multiple lines, after a certain size the entire input and page becomes unresponsive. At a certain point the entire browser tab dies.

Regex:

/^.*(<(img|iframe|script)( [^<]*)*>).*/m

Stackblitz for reproduction: https://stackblitz.com/edit/angularjs-btrpfi?file=home%2Fhome.html

Code I currently pass for testing:

<!-- Begin test script -->
<script type="text/javascript">
    var test = 123;
    var b = 24;
    var c = 22;
    var f = 56;

Steps to reproduce: Just add more lines and random content - doesn't really matter.

Any ideas how to get the multi line regex running? I'm aware in this simple case I can use a different approach to check for the tag inclusion compare to the multi-line regex approach, the original setup is a little more complex.

Upvotes: 0

Views: 77

Answers (0)

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