Ruby Regex: How to match pattern that follows another pattern?

Question

I have ID numbers that should come after the text ID: so my file consists of

ID: A1234 ID: A1235 ID: A1236

etc. I want to match /[A-Z]*[0-9]+/ but only if it comes after the characters ID:. How would I add that to the regular expression but not make it return ID: as part of the result? I just want it to match the regex that follows ID:, because at the end of the file I have numbers and it's returning them, but those aren't ID numbers.

Ian McMahon · Accepted Answer · 2013-02-25 20:38:01Z

2

/ID:\s*([A-Z]*[0-9]+)/

the parentheses capture what's inside the parentheses, and then you can refer to it using backreferences. If you post some code of how you're using the regex, I can try to add some more detail to show you how.

answered Feb 25, 2013 at 20:38

Ian McMahon

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