Vista - Re: regular expression howto

01-08-2008

"Doug" <Doug@xxxxxx> wrote in message
news:CF79F9DC-21BF-440B-A769-02DCB6E0AD9D@xxxxxx

Quote:

> $s="Service Pack Source Path: \\CPITGGMASA01\GMAS\GOLD\ipak\_SP\sp1 [IPAK
> NT5.26 (V4.0)]: Installed on 04/30/07 00:44 by SYSTEM"
>
> $p = [regex] "\[(.*)\]"
> $p.match($s).groups[1].value
>

Careful with that regex cause it is greedy:

22> "[foo] bar [baz]" -match "\[(.*)\]"
True
23> $matches[1]
foo] bar [baz

You can solve that in a couple of ways:

24> "[foo] bar [baz]" -match '\[(.*?)\]'
True
25> $matches[1]
foo

26> "[foo] bar [baz]" -match '\[([^\]]*)'
True
27> $matches[1]
foo

--
Keith

01-08-2008	#1 (permalink)
Keith Hill [MVP] n/a posts	Re: regular expression howto "Doug" <Doug@xxxxxx> wrote in message news:CF79F9DC-21BF-440B-A769-02DCB6E0AD9D@xxxxxx Quote: > $s="Service Pack Source Path: \\CPITGGMASA01\GMAS\GOLD\ipak\_SP\sp1 [IPAK > NT5.26 (V4.0)]: Installed on 04/30/07 00:44 by SYSTEM" > > $p = [regex] "\[(.)\]" > $p.match($s).groups[1].value > Careful with that regex cause it is greedy: 22> "[foo] bar [baz]" -match "\[(.)\]" True 23> $matches[1] foo] bar [baz You can solve that in a couple of ways: 24> "[foo] bar [baz]" -match '\[(.?)\]' True 25> $matches[1] foo 26> "[foo] bar [baz]" -match '\[([^\]])' True 27> $matches[1] foo -- Keith
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