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Home: Perl Programming Help: Regular Expressions: Alternative to alternation with |

dpavlenkov New User Dec 5, 2003, 10:18 AM Post #1 of 9 (26667 views) Alternative to alternation with | Can't Post Is there a way to create alternation without using | character? I am using a silly program that parses config file by splitting on |, and that destroys any regex with alternation. I would modify the program to use a different split character, but it is spread all over the code and perhaps that's too much work. Any lazy people with suggestions?

KevinR Veteran Dec 5, 2003, 10:34 AM Post #2 of 9 (26665 views) Re: [dpavlenkov] Alternative to alternation with | [In reply to] Can't Post have you tried using quotemeta? $yourstring = quotemeta($yourstring); will escape non word characters in the string. You can try it and see if it will work for your purpose. But why is spliting on the | messing you up? The character used for the split is removed from the string. -------------------------------------------------

dpavlenkov New User Dec 5, 2003, 11:24 AM Post #3 of 9 (26660 views) Re: [KevinR] Alternative to alternation with | [In reply to] Can't Post quotemeta would probably work, but config file is not in perl, it's simply a hash with | separators. like this: key1|value1 key2|value2 so you see if a value (for instance a regex) contains a | character, it will be cut off at that character by the parser. but there, I answered my own question, if I put a limit of 2 in split, that won't be a problem anymore, because it will only split once.

Recall Novice Dec 5, 2003, 1:02 PM Post #4 of 9 (26659 views) Re: [dpavlenkov] Alternative to alternation with | [In reply to] Can't Post You could just escape the pipe \|

KevinR Veteran Dec 5, 2003, 9:42 PM Post #5 of 9 (26655 views) Re: [dpavlenkov] Alternative to alternation with | [In reply to] Can't Post you mean the value can contain the file delimiter character? You should code your script so that the file delimiter is not allowed or is escaped or converted to ascii code. -------------------------------------------------

davorg Thaumaturge / Moderator Dec 7, 2003, 10:52 AM Post #6 of 9 (26652 views) Re: [dpavlenkov] Alternative to alternation with | [In reply to] Can't Post Giving split a third argument of 2 would be the easiest fix. But if you can't do that, how about using a different character to represent the pipe and then converting it once it's been read in from the config file. -- Dave Cross, Perl Hacker, Trainer and Writer http://www.dave.org.uk/ Get more help at Perl Monks

kencl User Jul 12, 2004, 6:15 AM Post #7 of 9 (26522 views) Re: [davorg] Alternative to alternation with | [In reply to] Can't Post Why do you say he can't do that? That's exactly what the limit parameter is for. >> If you can't control it, improve it, correlate it or disseminate it with PERL, it doesn't exist!

davorg Thaumaturge / Moderator Jul 12, 2004, 6:29 AM Post #8 of 9 (26520 views) Re: [kencl] Alternative to alternation with | [In reply to] Can't Post I didn't mean to imply that he shouldn't do that. That is, of course, the best solution. But in some cases, that solution won't be possible. I'm thinking of situations where (for example) the key value contains the separator. -- Dave Cross, Perl Hacker, Trainer and Writer http://www.dave.org.uk/ Get more help at Perl Monks

kencl User Jul 12, 2004, 6:31 AM Post #9 of 9 (26518 views) Re: [davorg] Alternative to alternation with | [In reply to] Can't Post ah, makes sense. Amazing how small the word "if" can be... >> If you can't control it, improve it, correlate it or disseminate it with PERL, it doesn't exist!

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