Refine documentation of `looking-back'.
* lisp/subr.el (looking-back): Do not recommend using looking-back. (bug#5689) * doc/lispref/searching.texi (Regexp Search): Refine.
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* lisp/subr.el (looking-back): Do not recommend using looking-back. (bug#5689) * doc/lispref/searching.texi (Regexp Search): Refine.