Re: Regular Expression in Xcode Editor: newlines+whitespace
Re: Regular Expression in Xcode Editor: newlines+whitespace
- Subject: Re: Regular Expression in Xcode Editor: newlines+whitespace
- From: Tomasz Kukielka <email@hidden>
- Date: Mon, 03 Nov 2008 09:40:40 -0700
- Thread-topic: Regular Expression in Xcode Editor: newlines+whitespace
By the way: is ICU regex API public in Mac OS X? Can I use it in my project?
Thanks,
Tom
On 11/3/08 7:06 AM, "Tom Worster" <email@hidden> wrote:
> On 11/2/08 11:38 PM, "Chris Espinosa" <email@hidden> wrote:
>
>> Xcode doesn't do cross-line regex matches. (Neither does grep, for
>> that matter.)
>>
>> If you are looking for a pattern at the beginning of the line, use the
>> regex "beginning of line" marker, "^". And of course you want to find
>> runs of whitespace, not just the first instance, so the regex you
>> want is
>>
>> ^\s+
>
> chris is right. ^ is the way to anchor a pattern at the start of a line.
>
> but ICU regex (which Xcode claims it uses for the regular expression find in
> the text editor) does match across lines. so, i'm curious....
>
> icu regex, like perl, supports multiline mode as an option. it also uses
> perl's syntax for turning options (i.e. modifiers) on or off within the
> regex.
>
> see the Flag Options section of
> http://www.icu-project.org/userguide/regexp.html
>
> http://www.perl.com/doc/manual/html/pod/perlre.html has a better explanation
> of what they mean. in multiline mode, ^ and $ match the beginning and end of
> lines within the string, otherwise they match the beginning and end of the
> string (which i would think, in Xcode, would be the file). in multiline
> mode, . matches any character except newline, otherwise it matches any
> character.
>
> nevertheless, but i can't get Xcode to do any cross-line matching with
> multiline mode turned off. i wonder if Xcode broke ICU regex in this aspect.
>
>
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