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need reqular expression in perl to find and replace

bostanian
New User

Aug 20, 2007, 12:51 PM

Post #1 of 4 (1279 views)

need reqular expression in perl to find and replace	Can't Post

Hi,

can someone help me to write a regular expression to find and reoplace the floowing.

Find string : c:\program files\bac\jnn\gin

Replace String : c:\progra~1\abcdef\ghik\lmn;

thanks

Srini

KevinR
Veteran

Aug 20, 2007, 8:49 PM

Post #2 of 4 (1274 views)

Re: [bostanian] need reqular expression in perl to find and replace [In reply to]	Can't Post

What are you actually trying to search and replace? Are you really just trying to replace 'c:\program files\' with 'c:\progra~1\'?

Read my signature regarding PMs. Thank you.
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bostanian
New User

Aug 21, 2007, 6:14 PM

Post #3 of 4 (1272 views)

Re: [KevinR] need reqular expression in perl to find and replace [In reply to]	Can't Post

Hi Kevin,

Thanks for your reply, I am trying to replace the later part of \program files\

capturing find sting in a variable

$find = \bac\jnn\gin ;

$replace = \abcdef\ghik\lmn;

by usuing $infile =~ s/$find/$replace/gi ;

which is not working..

Please let me know where am i doing the mistake ..

Thanks
Srini

KevinR
Veteran

Aug 21, 2007, 8:39 PM

Post #4 of 4 (1267 views)

Re: [bostanian] need reqular expression in perl to find and replace [In reply to]	Can't Post

You need to use some escaping in the search pattern. You can do that with the \Q[pattern]\E meta characters:

Code

$infile = 'c:\program files\bac\jnn\gin'; 
$find = '\bac\jnn\gin'; 
$replace = '\abcdef\ghik\lmn'; 
$infile =~ s/\Q$find\E/$replace/i; 
print $infile;

the backslashes in the search pattern will be interpolated if possible by the regexp. For example, \b is a word boundary instead of a literal \b. \p is also a meta character but I don't remember what it means.
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