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Re: not understanding pattern matching [message #178620 is a reply to message #178614]

Fri, 13 July 2012 03:22

Denis McMahon
Messages: 634
Registered: September 2010

Karma:

Senior Member

On Wed, 11 Jul 2012 19:31:12 -0400, Michael Joel wrote:

> I was trying to just first get it to replace the exact thing typed. Then
> move on to replacing any word within the %/i% and %i%
>
> $Scripture="this is a %/i%test%i%";
> preg_replace("%/i%test%i%","XXXXXXXX",$Scripture);
>
> This errors with Unknown modifier t I tried what I thought was escaping
> it by putting a \test but that just messes up more. See I haven't a
> clue.

http://php.net/manual/en/regexp.reference.delimiters.php

When you use a regex, the first character inside your quotes is taken as
the pattern delimiter.

In your case, this is a "%" character.

The format of a regex string is:

"delimiter pattern delimiter optional-modifiers"

Hence, "%/i%t" is the pattern "/i" with the modifier "t"

Try:

preg_replace("!%/i%test%i%!","XXXXXXXX",$Scripture);

This will use the "!" character as the pattern delimiter and should, in
this specific case, solve your problem. Generally it's a good idea to
pick a pattern delimiter that does not have special meaning to regex and
is not part of your data. This isn't always easy.

Rgds

Denis McMahon

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[Message index]

		not understanding pattern matching By: Michael Joel on Wed, 11 July 2012 22:35
		Re: not understanding pattern matching By: Michael Fesser on Wed, 11 July 2012 22:49
		Re: not understanding pattern matching By: Michael Joel on Wed, 11 July 2012 23:11
		Re: not understanding pattern matching By: Michael Fesser on Wed, 11 July 2012 23:26
		Re: not understanding pattern matching By: Michael Joel on Wed, 11 July 2012 23:31
		Re: not understanding pattern matching By: BootNic on Thu, 12 July 2012 01:32
		Re: not understanding pattern matching By: Denis McMahon on Fri, 13 July 2012 03:22
		Re: not understanding pattern matching By: Michael Joel on Wed, 11 July 2012 23:11
		Re: not understanding pattern matching By: Michael Joel on Thu, 12 July 2012 03:27

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