How to include character in regular expression

问题

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?

回答1:

Just double the expression:

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

Demo

来源：https://stackoverflow.com/questions/29124643/how-to-include-character-in-regular-expression