G'day ghosh123,

"But the below code is not able to match when there is a '_' or '-' in the string just after "Users of". For example 'Fusion' is matching but not 'Galaxy-AdvTech' and 'Enterprise_VO' etc."

Rubbish! The code you posted isn't matching any of your sample data:

$ perl -Mstrict -Mwarnings -e '
    while (<>) {
        if(/^Users of ([\w+\_\-]):\s+\(Total of ([0-9]+) licenses issu
+ed;\s+Total of ([0-9]+) (licenses|license) in use/ 
)
        {
                print "$1 |$2|$3 \n";
        }
        else {
            print "No match!\n";
        }
    }
'
Users of Enterprise_VO: (Total of 1 license issued; Total of 0 license
+s in use)
No match!
Users of Fusion: (Total of 4 licenses issued; Total of 0 licenses in u
+se)
No match!
Users of Galaxy-AdvCTS: (Total of 5 licenses issued; Total of 0 licens
+es in use)
No match!
Users of Galaxy-AdvTech: (Total of 5 licenses issued; Total of 0 licen
+ses in use)
No match!
Users of Galaxy-Common: (Total of 30 licenses issued; Total of 1 licen
+se in use)
No match!
[download]

This is because firstly, [\w+\_\-] is only matching a single character which will either be: a word character (alphanumeric, underscore [and others - see perlrecharclass - Backslash sequences]), a plus sign or a hyphen (both backslashes are unnecessary and the underscore is already covered by the \w) - [\w-]+ is what you want here. And, secondly, the first instance of licenses does not match the word "license" - licenses? is what you want here. Putting all that together:

$ perl -Mstrict -Mwarnings -e '
    while (<>) {
        if(/^Users of ([\w-]+):\s+\(Total of ([0-9]+) licenses? issued
+;\s+Total of ([0-9]+) (licenses|license) in use/)
        {
                print "$1 |$2|$3 \n";
        }
        else {
            print "No match!\n";
        }
    }
'
Users of Enterprise_VO: (Total of 1 license issued; Total of 0 license
+s in use)
Enterprise_VO |1|0 
Users of Fusion: (Total of 4 licenses issued; Total of 0 licenses in u
+se)
Fusion |4|0 
Users of Galaxy-AdvCTS: (Total of 5 licenses issued; Total of 0 licens
+es in use)
Galaxy-AdvCTS |5|0 
Users of Galaxy-AdvTech: (Total of 5 licenses issued; Total of 0 licen
+ses in use)
Galaxy-AdvTech |5|0 
Users of Galaxy-Common: (Total of 30 licenses issued; Total of 1 licen
+se in use)
Galaxy-Common |30|1
[download]

However, most of that regex is superfluous: /^Users of ([^:]+): \(Total of (\d+) [^0-9]+ (\d+)/ matches all of your supplied data:

$ perl -Mstrict -Mwarnings -E '
    while (<>) {
        if (/^Users of ([^:]+): \(Total of (\d+) [^0-9]+ (\d+)/) {
            say "$1 $2 $3";
        }
    }
'
Users of Enterprise_VO: (Total of 1 license issued; Total of 0 license
+s in use)
Enterprise_VO 1 0
Users of Fusion: (Total of 4 licenses issued; Total of 0 licenses in u
+se)
Fusion 4 0
Users of Galaxy-AdvCTS: (Total of 5 licenses issued; Total of 0 licens
+es in use)
Galaxy-AdvCTS 5 0
Users of Galaxy-AdvTech: (Total of 5 licenses issued; Total of 0 licen
+ses in use)
Galaxy-AdvTech 5 0
Users of Galaxy-Common: (Total of 30 licenses issued; Total of 1 licen
+se in use)
Galaxy-Common 30 1
[download]

I understand that you posted the wrong code but a small change in the original will work as (apparently) intended. Specifically, the first '+' should be moved outside the square brackets since "\w", "_", "-" are all in the set you're looking for.

In other words, change ([\w+\_\-]) to ([\w\_\-]+). Better yet, since "_" is included in "\w" and "-" doesn't need to be escaped if it's first or last, you can simplify this to ([\w-]+).

ghosh123: You may find davido's Perl Regular Expression Tester useful for seeing the effects of varions regex/string combinations. Also see YAPE::Regex::Explain for off-line explainations of the components of regexes with pre-5.8 syntax, which the regexes shown by you in this thread seem to be.

So you want to figure out why, is that your question?

Can you explain what  ([\w+\_\-]) means?

Ooops ... I am sorry, I just pasted the wrong code.
Actually I have been using this
It was working fine as long as there was no _ and - But now , how it is to be changed to take care of '_' and '-' ?



if(/^Users of (\w+):\s+\(Total of ([0-9]+) licenses issued;\s+Total of
+ ([0-9]+) (licenses|license) in use/)
[download]

how it is to be changed to take care of '_' and '-' ?

Can you answer my question from Re: regular expression not matching?