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I have this text: 

x A1 ,A2-A4 xx, xxx A5  xxxx

I have this regular expression: 

[A-Z]{1,3}-?\d{1,3}

It gets 4 matches: 

A1,A2,A4,A5

But I need to modify this regular expression to get these 3 matches: 

A1,A2-A4,A5

Can anyone help me?

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Just double the expression:

[A-Z]{1,3}-?\d{1,3}(?:-[A-Z]{1,3}-?\d{1,3})?

Demo

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3 Comments

This works exactly as I need, thanks. I hope I will never need regular expressions again...
@Ondřej " hope I will never need regular expressions again" A ha, like it's going to happen ;-)
@Ondřej better learn them (it's not that hard), and see how much code you won't need to write ;)

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