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aacaff8891
The documentation of the various M4sugar macros that take regex arguments did not explain GNU M4’s idiosyncratic regex syntax, which resembles POSIX basic regexes but is not actually the same, nor is it the same as Emacs regexes. Add cross-references to the GNU M4 manual to rectify this. Reported by Luke Mewburn <Luke@Mewburn.net>. Patch originally by Luke Mewburn, revised by Zack Weinberg. * doc/autoconf.texi: Add cross-references from the documentation of ‘m4_bpatsubst’ and ‘m4_bregexp’ to the GNU M4 manual sections that explain ‘patsubst’ and ‘regexp’. Also add cross-references from ‘m4_bmatch’ and ‘m4_bpatsubsts’ to ‘m4_bregexp’ and ‘m4_bpatsubst’ respectively.