Re: Checking for character absence with regular expressions

On Friday 16 July 2004 20:21, Rory McKinley wrote: > I am currently trying to check for the absence of certain substrings > within larger strings using > regular expressions. I know that I could use on of the string functions, > but in the interests of > flexibility I must use a regexp match of some shape or variety. Up until > now, Could you explain why you need flexibility? > An example of my problem: > > I need to check that the substring " R" (that's a space followed by an > uppercase R) is not contained within my haystack. A simple strpos() would suffice. > E.g. Whatever pattern I match, if I match it against the following > haystacks: > > "Blah Blah R 99.99" or "Blah Blah R99.99" it should return negative > (i.e. the substring is contained within the haystack) > > while > > "Blah Blah 99.99CR" should return positive (i.e. the substring is not > within the haystack). TRUE/FALSE can easily be reversed using !. -- Jason Wong -> Gremlins Associates -> www.gremlins.biz Open Source Software Systems Integrators * Web Design & Hosting * Internet & Intranet Applications Development * ------------------------------------------ Search the list archives before you post http://marc.theaimsgroup.com/?l=php-general ------------------------------------------ /* All of a sudden, I want to THROW OVER my promising ACTING CAREER, grow a LONG BLACK BEARD and wear a BASEBALL HAT!! ... Although I don't know WHY!! */