Re^2: regular expression to match specific members of a bus

Sorry, I am trying to match a word segment with a specific number in it, but there can't be any extra digits following that number. I think I might have cleared that up when I updated the question

if I am looking for foo1 then:

foo1 should match but foo10 should not match

and foo1bar should match but foo10bar should not match

if I were looking for bar25 then:

bar2 would not match, bar25 would match , bar250 would not match

bar25foo would match and bar250foo would not match

Thanks for the help! I think the AnamolousMonk has my solution

Comment on Re^2: regular expression to match specific members of a bus_name

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Re^3: regular expression to match specific members of a bus_name by Laurent_R (Canon) on Feb 12, 2016 at 18:52 UTC
Yes, it seems that you've figured it out by now, thanks to AnamolousMonk: the easiest way for achieving what you want is a negative look-ahead assertion: `my $regex = qr/\w{3}_[tr]x_[pn]\d(?!\d)/;` [download] But even if you did not know about zero-width assertions, you could still have obtained more or less the same resukt with an alternation: `my $regex = qr/\w{3}_[tr]x_[pn]\d(\D\|$)/;` [download] which means: match everything to the required digit, followed by either a non-digit or the end of the string. TIMTOWTDI.	[reply] [d/l] [select]

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Re^3: regular expression to match specific members of a bus_name
by Laurent_R (Canon) on Feb 12, 2016 at 18:52 UTC

AnamolousMonk

my $regex = qr/\w{3}_[tr]x_[pn]\d(?!\d)/;
[download]

my $regex = qr/\w{3}_[tr]x_[pn]\d(\D|$)/;
[download]

TIMTOWTDI.

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