Comments on: Regular Expressions for NSString

By: Byron

Byron — Fri, 11 Jan 2008 18:41:28 +0000

I am really glad I bumped into this page while looking to support regex in my app. Now I don’t have to link and manage yet another 3rd party framework.

By: Viktor

Viktor — Wed, 09 Jan 2008 01:00:33 +0000

The backspace in the metacharacters (like in “\d” for a number) has to be escaped in the @”…” string. Confusing if you aren’t used to that.

By: Daniel

Daniel — Tue, 27 Feb 2007 20:19:20 +0000

It appears that my problem is with multi line matching, rather than text encoding.

By: Simon

Simon — Sun, 18 Feb 2007 19:29:45 +0000

@Daniel: Give it a try using the same encoding (which one shouldn’t matter) for both your string AND your regular expression.

By: Daniel

Daniel — Sun, 18 Feb 2007 01:46:52 +0000

I am new to cocoa programming, and I have this very useful.

However when I try to use a NSString from another source, ie a file, it no longer matches.

NSString *taskOutput;
taskOutput = [[NSString alloc] initWithData: data encoding:NSUTF8StringEncoding];

I believe this an encoding problem, but am at a loss as to what encoding to use.

By: Rob Rix

Rob Rix — Sat, 17 Feb 2007 12:55:30 +0000

Obvious in hindsight– many thanks for the cue.

For the interested, the Predicate Programming Guide states here:

file:///Developer/ADC%20Reference%20Library/documentation/Cocoa/Conceptual/Predicates/index.html#//apple_ref/doc/uid/TP40001789

that the regexp format is as declared here:

http://icu.sourceforge.net/userguide/regexp.html