[Webkit-unassigned] [Bug 38142] RegExp caching

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=38142





--- Comment #5 from Renata Hodovan <hodovan.renata at stud.u-szeged.hu>  2010-04-26 23:53:16 PST ---
(In reply to comment #3)
> Do you have data on where ws-email creates regular expressions?

ws-email tests random strings whether they are valid e-mail addresses. The
neccessery regular expressions are too long, hence they are created from
substrings. One such example follows:

 var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
 var validChars="\[^\\s" + specialChars + "\]";
 var quotedUser="(\"[^\"]*\")";
 var atom=validChars + '+';
 var word="(" + atom + "|" + quotedUser + ")";
 var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

Every time when the function is called these regular expressions are recreated.
This takes a lot of time because regular expressions parsing is expensive.
Furthermore there are many fallbacks to PCRE.

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