[Nano-devel] Subexpression replacement.

[David Benbennick]

This patch replaces utils.c:strstrwrapper() and fixes
search.c:replace_regexp() so that subexpression regexp replacement works. 
For example, make a file with the line

 lookatthis

and put the cursor at the beginning of the line (a space).  Regexp
search for "(look)(at)(this)", and replace with "\3\2\1".  It should
produce the line

 thisatlook

Instead you get

 tthika loo

subexp.patch
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pgpQ0x6OvluIR.pgp
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