Re: [Boost-users] regex lib - using replace

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2005-05-10 16:55:49

Lucian Ion wrote:
> Hi,
> I need one regular expression and one format string to do the following
> 1) if text starts with s1, replace s1 with r1
> 2) else, if text starts with s2, replace s2 with r2
> 3) else, if text starts with s3, replace s2 with r3
> 4) else, prepend r3 to text
> 
> While I managed to work out the first three using an expression like 
> (^s1)|(^s2)|(^s3) and the format as 1?r1:2?r2:3?r3:
> I have no idea how to include the fourth case into my expression. Any 
> suggestion?

How about "^(?:(s1)|(s2)|(s3))?" and "1?r1:2?r2:3?r3:r4"?

Ben.