John Maddock wrote:
Lorenzo Bettini wrote:
Hi
is there any plan to support more than 9 back references in the regex library?
You can have as many marked sub-expressions as you want, and refer to them in the match_results structure once you have a match. What you can't do at present is have a true back-reference say \12 in your expression. This is basically a problem with the regex syntax, so if you know of a good syntax extension that's already in use then it would trivial to support this.
You could use xpressive, which handles this case. Any \ddd where d is a decimal digit is interpreted as a back-reference if - The backreference number is less than 10 -OR- - The backreference number is less than or equal to the number of capturing groups seen so far. I believe that's perl's rule. -- Eric Niebler Boost Consulting www.boost-consulting.com