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Special RegExe `\b` Causes Marking to Freeze
See original GitHub issueWhen highlighting with regular expression some of them cause browsers to hang and the script stops responding. For example providing only \b as a regex.
I am working on an app where user can provide custom regex that is used for highlighting and we highlight on every change of the input. Imagine I want to highlight \bJohn\b which is a valid regex. When the user types \b everything freezes. How can I detect this type of a regexes and skip highlighting for them?
Steps to reproduce
Open Custom regular expression highlighting fiddle provided in the documentation, input this regular expression /\b/gmi and click Mark. Instead of highlighting nothing my browsers hangs.
Environment
- Safari, Crome
- mark.js version 8.1.1
Issue Analytics
- State:
- Created 7 years ago
- Comments:6 (2 by maintainers)
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LOL, I just noticed that… let me see if I can come up with a better solution then.
What a coincidence - I’m also working on a website where users can provide custom regex to be highlighted, and I have the same problem. If you pause the Javascript you can see that the code is stuck on a loop where it continuously generates new empty mark elements.
The loop happens on this line: https://github.com/julmot/mark.js/blob/master/dist/mark.js#L453