This is the PHP regular expression I would like to convert into a JavaScript regular expression:
/(?<!\..|\...|\....)([\?\!\.]+)\s(?!.\.|..\.|...\.)/u
Are there tools to do such a conversion?
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2possible duplicate stackoverflow.com/q/1131918/777982TheTechGuy– TheTechGuy2011-07-26 02:09:19 +00:00Commented Jul 26, 2011 at 2:09
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There is no such thing as a "PHP regular expression" or a "JavaScript regular expression".Lightness Races in Orbit– Lightness Races in Orbit2011-07-26 02:14:53 +00:00Commented Jul 26, 2011 at 2:14
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1Hum. Well the above regular expression works with PhP but not with JavaScript. What's the problem?Randomblue– Randomblue2011-07-26 02:15:54 +00:00Commented Jul 26, 2011 at 2:15
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1There are, unfortunately, some slight differences between JavaScript's regexp engine and PHP's regexp engine. But true, regular expression "should" be universal between languages.Alan B. Dee– Alan B. Dee2011-07-26 02:22:25 +00:00Commented Jul 26, 2011 at 2:22
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There's no negative lookbehind in Javascript's regex, that's why it doesn't work.Digital Plane– Digital Plane2011-07-26 02:27:12 +00:00Commented Jul 26, 2011 at 2:27
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1 Answer
(?<!stuff goes here) is a negative lookbehind which isn't supported by JavaScript's regex implementation. There are some ways to mimic it, but it does not work properly for all cases - yours looks like one of those to me.
If you want to keep using this specific regex, but from JavaScript, you could consider simply passing the string to PHP using Ajax, which would then run the regex on it.
