$Bill wrote: > ... and \1 is deprecated for $1. I believe that should read [thanks Greg!] "...and \1 is deprecated on the right side of s///". On the left side (as in any regexp), \1 and $1 differ. But as a holdover from sed, \1 means the same as $1 on the right side of the subst.
\1 isn't the same as $1, in that s/(.)\1//; deletes duplicate chars, while; s/(.)$1//; depends upon the value of $1 - which, in this case'd be set *before* the subst got invoked. On the right hand side, $1 is what we expect (the final matched text inside the first set of parens). \1 (on the LHS) also can/will change during the course of a regex evaluation - as the parser/matcher works, \1 will take on different values during backtracking etc - though, in the end \1 is the same as $1. I've never understood it but I belive perl golfer/obfu folks can do strange and terrible things w/ the difference. a Andy Bach, Sys. Mangler Internet: [EMAIL PROTECTED] VOICE: (608) 261-5738 FAX 264-5932 "If there be time to expose through discussion the falsehood and fallacies, to avert the evil by the process of education, the remedy to be applied is more speech, not enforced silence." Justice Louis Brandeis _______________________________________________ Perl-Win32-Users mailing list [EMAIL PROTECTED] To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
