RegexKitLite How to convert a PHP regex Expression in objective c

Question

I used this regex expression to search for img src in a string in one on my site. Now I wan't to use this expression to do the same thing in objective c. How can I do that using RegexKitLite? This is my expression

/<img.+src=[\'"]([^\'"]+)[\'"].*>/i

@Tim Pietzcker

Your code works great but for example if I try to search img in this string

<p><a href="http://www.nationalgeographic.it/popoli-culture/2011/08/03/news/per_la_tomba_del_boia-443612/?rssimage"> <img src="http://www.nationalgeographic.it/images/2011/07/29/115624013-20034abf-4d91-40fe-98ab-782f06a9854d.jpg" width="140" align="left" hspace="10"></a>Scoperta in America del Sud la sepoltura pre-incaica di un uomo circondato da coltelli cerimoniali che secondo gli archeologi eseguiva sacrifici umani</p>

I have this result in my array:

matchArray: (
    "<img src=\"http://www.nationalgeographic.it/images/2011/07/29/115624013-20034abf-4d91-40fe-98ab-782f06a9854d.jpg\" width=\"140\" align=\"left\" hspace=\"10\">"
)

How can I mod your regex to only get the content of src tag? thank you so much

I am pretty sure that apple are not accepting application that use RegexKitLite any more because it used a private library (libicu), you are supposed to use NSRegularExpression now, which uses the same libicu library. — Nathan Day
– Nathan Day, Commented Aug 4, 2011 at 10:17

Tim Pietzcker · Accepted Answer · 2011-08-03 11:47:20Z

1

The / delimiters are throwing you off. Also, you should at least use lazy quantifiers. Try this:

NSString *regexString = @"(?i)<img.+?src=['\"]([^'\"]+)['\"].*?>";

This breaks when filenames contain quotes, by the way. Could that be a problem for you?

A regex that's a bit safer (and that handles quotes well) would be

NSString *regexString = @"(?i)<img[^<>]+?src=(['\"])((?:(?!\\1).)+)\\1[^<>]*>";

However, now the matches filename will be in capture group 2, not 1, so you need to modify any code that uses the filename after the match.

edited Aug 3, 2011 at 11:47

answered Aug 3, 2011 at 11:41

Tim Pietzcker

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2 Comments

paul_1991 Over a year ago

Thank you! Your code works but I only wan't the content of the src= tag! I added some info at my question! look

Tim Pietzcker Over a year ago

You need to access the second capturing group. I think you get this using the capture:2L parameter. Check page 14 in the RegexKitLite manual.

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