Perl regex match

Eshan_k has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monks,

I want to match only words like "abcunit", "hedhdunit", "ewedfunit" and get into array from a text file using regex. Can any one please tell how can I get only that word in line. So for I am using /(....unit)/g but the charcters before "unit" are varying. Can any one please tell perfect regex for this. Any help will be greatly appreciated.

unit : abcunit
unit : hedhdunit 
unit : ewedfunit 
unit : eedunit
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Re: Perl regex match by LanX (Saint) on Feb 11, 2015 at 03:22 UTC
please have a look at `perlretut#Using-character-classes` and try `\w+` instead of `...` Cheers Rolf PS: Je suis Charlie!	[reply] [d/l] [select]
Re: Perl regex match by manoj_speed (Prior) on Feb 11, 2015 at 07:14 UTC
As LanX mentioned, you can use \w+ to match any word character before 'unit' keyword. Just check the code below: Code # Consider I parsed a file and stored content into below array. my @arr=('line 1 abcunit', 'line 2hedhdunit', 'line 3 ewedfunit', 'line 4 eedunit', 'line 5 abdunited'); for my $str(@arr) { print "Unit : $& \n" if ($str =~ m/\w+unit\b/); } # \w+ -> To match any word character before pattern 'unit' # \b -> to match the exact word ends with 'unit'. Output: Unit : abcunit Unit : 2hedhdunit Unit : ewedfunit Unit : eedunit -- The wisest mind has something yet to learn...	[reply]
Re: Perl regex match by Discipulus (Canon) on Feb 11, 2015 at 09:42 UTC
If you want to practice with regexes consider using, if on windows, a coach or Davido's precious regex tester that is now here also onther testing site suggested by Eily also, anonimously suggested, rxrx and this one and this other one and also VRegExp HtH L* There are no rules, there are no thumbs.. Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.	[reply] [d/l]
Re: Perl regex match by Anonymous Monk on Feb 11, 2015 at 03:19 UTC
So for I am using /(....unit)/g but the charcters before "unit" are varying. Ask yourself what characters? Then make your regex more specific, see perlrequick and perlrebackslash	[reply]


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