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php Programming Glossary: lookaheadconvert url to links from string except if they are in a attribute of a html tag http://stackoverflow.com/questions/12538358/convert-url-to-links-from-string-except-if-they-are-in-a-attribute-of-a-html-tag this is a problem for you or not . It uses a negative lookahead to make sure that there is no closing before any opening because.. technique here is a bit more elaboration. # starts the lookahead assertion now your pattern will only match if this subpattern.. row so not a single or in between # the closing # ends the lookahead subpattern Note that I changed the regex delimiters because..
Minify/compress CSS with regex? http://stackoverflow.com/questions/15195750/minify-compress-css-with-regex The selector check for removing spaces before the negative lookahead can slow this down compared to proper parsers. Parsers already..
“vertical” regex matching in an ASCII “image” http://stackoverflow.com/questions/17039670/vertical-regex-matching-in-an-ascii-image past the first X . We can do this via a lookbehind and lookahead. Perl only supports constant length lookbehind but has the K.. match more than two lines we have to do the recursion in a lookahead and then advance the match position to the next line and repeat... To do this we essentially put the whole regex into a lookahead. The regex engine makes sure to advance the position every time..
How to check if string is a valid XML element name? http://stackoverflow.com/questions/2519845/how-to-check-if-string-is-a-valid-xml-element-name name Explanation A Beginning of the string XML Negative lookahead assert that it is impossible to match XML a z Match a non digit..
Validating US phone number with php/regex http://stackoverflow.com/questions/3357675/validating-us-phone-number-with-php-regex share improve this question You can resolve this using a lookahead assertion . Basically what we're saying is I want a series of.. by some digits. d # Now grab the actual digits the lookahead doesn't grab them # The Extension is Optional x x modifier..
PHP split string into integer element and string http://stackoverflow.com/questions/4537994/php-split-string-into-integer-element-and-string share improve this question You can use preg_split using lookahead and lookbehind print_r preg_split '# d a z #i' 0982asdlkj prints..
Minifying final HTML output using regular expressions with CodeIgniter http://stackoverflow.com/questions/5312349/minifying-final-html-output-using-regular-expressions-with-codeigniter regex by about 20 . There is an alternation group in the lookahead which is ripe for applying Friedl's unrolling the loop efficiency..
How to find all Youtube video ids in a string using a regex? http://stackoverflow.com/questions/5830387/how-to-find-all-youtube-video-ids-in-a-string-using-a-regex # End recognized pre linked alts. # End negative lookahead assertion. w. # Consume any URL query remainder. ~ix' ' a href.. any pre linked URLs you can safely remove the negative lookahead assertion which tests for this condition The assertion beginning.. Renamed function to camelCase. Improved pre linked lookahead test. Edit 2011 07 27 Added new user and ytscreeningroom formats..
Match a^n b^n c^n (e.g. “aaabbbccc”) using regular expressions (PCRE) http://stackoverflow.com/questions/7434272/match-an-bn-cn-e-g-aaabbbccc-using-regular-expressions-pcre Explanation If you consider the regex without the positive lookahead assertion the ... part you have this ~^a b 1 c ~ This does nothing.. the number of b s. And this is what the expression in the lookahead assertion does a 1 b c . The c is necessary so we don't only..
PHP Regular expression to match keyword outside HTML tag <a> http://stackoverflow.com/questions/7798829/php-regular-expression-to-match-keyword-outside-html-tag-a mega link.php 0 a ' str The expression inside the negative lookahead matches up to the next closing a tag but only if it doesn't.. it means the word Moses is inside an anchor element so the lookahead fails and no match occurs. Here's a demo . share improve this..
php regex to match outside of html tags http://stackoverflow.com/questions/7891771/php-regex-to-match-outside-of-html-tags or before any . The latter test is easier to accomplish as lookahead assertions can be variable length asf foo barr ^ See also http..
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