If your "XXX" isn't expected to contain any whitespace, then you could grab everything after "Label1 :" until you hit some whitespace, eg: 
$txt =~ /^Label1 : (.*?)\s+/

[download]

Note the anchoring "^" in the above, and the use of ".*?" to make it non-greedy (if that's actually what is required).

However.... it seems to me that split would be a better tool for this task: 

my ($wanted) = (split /\s?Label\d\s:\s/, $txt)[1];

[download]

Cheers,
Darren :)

In reply to Re: RegEx question by McDarren
in thread RegEx question by mariuspopovici

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