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chamenas
Wizard
Joined: 26 Mar 2008
Posts: 1547
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 Posted: Tue Jan 06, 2009 8:53 pm
Grr at Regex again
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Well, school has me caught up and so I've made little progress on my scripts as I'd rather play the game with what time I have. However, I'm setting up a quick little script for reading, problem is with the regex:
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read ([\w'- ]+)page (\d+)
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When I try to test it, I get an out of order character class (145) error. I have absolutely no clue what this is or means, I rearrange the -, ', and ' ' but I only get different numbers between the (). What am I doing wrong? How do I avoid this in the future? |
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Fang Xianfu
GURU
Joined: 26 Jan 2004
Posts: 5155
Location: United Kingdom
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Posted: Tue Jan 06, 2009 8:55 pm
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- is a special character in classes, so you can do things like [a-z]. The "out of order class" is because it looks like you're doing ['- ], when a space actually comes before an apostrophe, so it doesn't know what to do. If you literally meant a hyphen to be part of the class, you need to escape it with \.
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Vijilante
SubAdmin
Joined: 18 Nov 2001
Posts: 5182
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Posted: Tue Jan 06, 2009 9:32 pm
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You may also put the hyphen last, the regex engine will then see that it isn't providing a range of characters for the class and treat the hyphen as a literal. [\w' -] would be a correct usage, or as Fang said escpae it [\w'\- ]
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chamenas
Wizard
Joined: 26 Mar 2008
Posts: 1547
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Posted: Tue Jan 06, 2009 9:59 pm
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Thank you.
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