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Suppose I want to append two digit numbers in my file with "some_thing".

Like from this:

12 23 45

to

12_something 23_something 45_something

How can I do this using regular expression replacement?

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up vote 3 down vote accepted

& is the whole match, so just use &_something in the substitute operation.

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Thanks, it works! – xiaohan2012 May 10 '12 at 3:35
    
Is there a difference between using & and \0? – Bernhard May 10 '12 at 5:38
2  
@Bernhard: not according to sub-replace-special, except varying by the magic option. – Ignacio Vazquez-Abrams May 10 '12 at 5:40

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