php - Regex equals condition except for certain condition -

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i have written following regex in php use within preg_replace().

/\b\s*(.com|.net|.us|.biz|.org|.info|.xxx|.mx|.ca|.fr|.in|.cn|.hk|.ng|.pr|.ph|.tv|.ru|.ly|.de|.my|.ir)\s*\b/i

this regex removes urls string pretty far (though sure can write better one). need able add exclusion though specific domain. pseudo code this:

if string contains: .com or .net or. biz etc... , not contain: foo.com execute condition.

any idea on how this?

just add negative lookahead assertion:

/(?<=\s|^)(?!\s*foo\.com)\s*\.(com|net|us|biz|org|info|xxx|mx|ca|fr|in|cn|hk|ng|pr|ph|tv|ru|ly|de|my|ir)\s*\b/im

also, remember need escape dot - , can move outside alternation since each of alternatives starts dot.


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