Re: How do I match a expression start with $a and not contain $b after $a

/$a(?!.*$b)/

I will have to kill those who comment on my usage of the dot star :)

Comment on Re: How do I match a expression start with $a and not contain $b after $a Download Code

Replies are listed 'Best First'.
Re (tilly) 1: Answer: How do I match a expression start with $a and not contain $b after $a by tilly (Archbishop) on Jan 28, 2002 at 18:41 UTC
At the risk of death, you need a /s modifier if you want the intermediate junk to be able to include returns. Also you should be using \Q and \E escapes. `/\Q$a\E(?!.*\Q$b\E)/s` [download] (The mistake of using $a and $b for normal use was the fault of the questioner, and not you.)	[reply] [d/l]
Re: Re: How do I match a expression start with $a and not contain $b after $a by Anonymous Monk on Jan 29, 2002 at 06:29 UTC
That regex will match "foobarfoo" if $a = "foo" and $b = "bar", but it shouldn't. See this node. -Anomo	[reply]