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Reg: Clarification in Pattern Matching
Joined: 13 Aug 2005
Posts: 12
Reg: Clarification in Pattern Matching
Hai Folks,
I have a very small clarification in pattern matching, though it
seems to be so silly I`m not able to find a solution, please help me in this
regard. I want to match a string into which a particular string should not be
present, i.e. You can assume any string which contains lots of words out of
which i want to match a pattern in which words starting with "b" should be
matched and ending should be "y" and between "b" and "y" no "a" should be
present. This can be done using m/b(?!a)y/ig, but it is not working right for
me. In detail, i want to search for html tags i.e. <b> and i should match start
<b> and end </b> inside of which no <b> tag should be present. Please help me in
this regard.
Thanks in Advance,
Regards
Krish
Krish
Senior Software Engineer (Perl)
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Joined: 28 Feb 2006
Posts: 1
Reg: Clarification in Pattern Matching
--- In Perl_Official@yahoogroups.com, Krishna Prasad <skpkrish@...> wrote:
>I want to match a string into which a particular string should not be
>present, i.e. You can assume any string which contains lots of words
>out of which i want to match a pattern in which words starting with
"b" >should be matched and ending should be "y" and between "b" and
"y" no >"a" should be present. This can be done using m/b(?!a)y/ig,
but it is >not working right for me.
[ysawant@ipmon01 ~]$ cat match_trial.pl
#!/usr/bin/perl
use strict;
while (<>) {
print if (m/b[^a]*y/i);
}
[ysawant@ipmon01 ~]$ cat somefile
this is a sample file
with a b in it
b for bold
an html tag
b is also for bank
and bay
bay of bengal?
bblahy
by
bigy
[ysawant@ipmon01 ~]$ ./match_trial.pl somefile
by
bigy
[ysawant@ipmon01 ~]$
Cheers
Yogesh
Joined: 21 May 2004
Posts: 44
Reg: Clarification in Pattern Matching
>>>>> "Yogesh" == Yogesh Sawant <yoga_sawant@...> writes:
Yogesh> print if (m/b[^a]*y/i);
That strategy works fine if "a" is a single character, but fails miserably
when you have a multichar string there. The solution I posted will work for
either.
--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@...> <URL:http://www.stonehenge.com/merlyn/>
Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
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Joined: 13 Aug 2005
Posts: 12
Reg: Clarification in Pattern Matching
Hai Yogesh,
Thanks for your initiative to reply me. But probably you have
misunderstood my requirement and Mr. Merlyn has very well understood that and it
helped me a lot. Anyway thanks a lot Yogesh.
Regards
Krish
merlyn@... wrote: >>>>> "Yogesh" == Yogesh Sawant
<yoga_sawant@...> writes:
Yogesh> print if (m/b[^a]*y/i);
That strategy works fine if "a" is a single character, but fails miserably
when you have a multichar string there. The solution I posted will work for
either.
--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@...> <URL:http://www.stonehenge.com/merlyn/>
Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!
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Krish
Senior Software Engineer (Perl)
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