Hi Zimmi, On Fri, Jul 10, 2015 at 1:26 PM, Zimmi <zimmi73@xxxxxxxxx> wrote: > > Are only lookahead (?=foo) supported in mod_substitute, and not the other > (negative lookahead, lookbehind and negative lookbehind) ? > Other syntax or did I miss something ? A lookbehind assertion needs its subject to be placed *after* it, so eg. "a" preceded by "m" is "(?<=m)a". So in your examples: > > # 2. Lookbehind, not OK : nothing happens > # Expected : word 'animals' changed: > # Llamas are my favorite animAls. > Substitute "s/a(?<=m)/A/" => Substitute "s/(?<=m)a/A/" > > # 3. Negative lookahead, not OK : nothing happens: > # Expected : all remaining 'a' changed to '&' except last one in word > 'animals': > # Ll&m&s &re my f4vorite &nimals. > Substitute "s/a(?!l)/&/" => Substitute "s/a(?!\l)/&/" (The pipe has special meaning otherwise, but I'm not sure about your goal here...). > > # 4. Negative lookbehind, not OK : changes all remaining occurrences of 'a' > to 'Q' ? Why ? > # Expected : all remaining 'a' changed to 'Q' except last 'a' in word > 'animals' > # and first 'a' in 'Llamas' if not changed by rules before. > Substitute "s/a(?<!m)/Q/" => Substitute "s/(?<!m)a/Q/" Regards, Yann. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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