Drop of performance between FF31 and FF32 for matching a regexp
Hello,
I'm trying to fix an addon on firefox 32 (sometime freezes the browser), I finally found the problem : it is a regexp execusion (with REGEXP.test(STRING) ).
For example, firstly load this page (I know it is a script) in FF31 : https://developer.cdn.mozilla.net/media/js/main-min.js?build=db5035d Display the developer tools and in the JS console copy/paste the following portion of code (I've simplified to a maximum to only let the problematic part of the regexp) :
test = "((\\S|\\s)+;\\s*\\n){10,}"; reg = new RegExp(test, "i"); reg.test(document.body.innerHTML)
The script terminates quickly (less than a second).
Do the same in FF32 : the brower becomes unresponsive and finally ask for stopping the execution of the script.
Could you help me understand why FF32 does not have the same behavior as FF31 ? Is there a workaround ?
ყველა პასუხი (1)
I can confirm that this happens with those STR. It fails when the result is false.
test = "((\\S|\\s)+;\\s*\\n){3,}"; reg = new RegExp(test, "i"); reg.test(document.body.innerHTML) -> true test = "((\\S|\\s)+;\\s*\\n){4,}"; reg = new RegExp(test, "i"); reg.test(document.body.innerHTML) -> false
I see that you have filed a bug report about this.
- bug 1070935 - Drop of performance between FF31 and FF32 when executing a regexp