php - Regex to match URL except for some websites using Look Ahead

Solution:

If you just want to require a URL to havehttp,www andcom in it, but notmysite in the host part, then you may use

preg_match('~^https?://(?:[^./]+\.)*(?!mysite)[^./]+\.com(?:‌​/.*)?$~', $url)
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See the regex demo

Details:

• ^ - start of string
• https?:// -http:// orhttps://
• (?:[^./]+\.)* - zero or more sequences of:
  • [^./]+ - 1+ chars other than. and/
  • \. - a literal dot
• (?!mysite)[^./]+ - 1+ chars other than. and/ that - up to.com - does not equalmysite
• \.com - a.com string
• (?:‌​/.*)? - 1 or 0 sequences of
  • / - slash
  • .* - any 0+ chars other than line break chars
• $ - end of string.

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