Hi list!I was testing mod_substitute and lookaheads. I tested with the simple setup below (a simple string in an index.html, and a .htaccess file), and the lookahead yields expected result, the negative lookahead and the lookbehind have no effect.
The negative lookbehind has a behaviour that I do not understand.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 ?And as a bonus question, why is the last test ( Substitute "s/a(?<!m)/Q/" ) changing all letters to 'Q' instead of not changing the string like the 2nd and the 3rd test ?
Thanks for sharing your insights! Zimmi SETUP index.html : Llamas are my favorite animals. .htaccess : AddOutputFilterByType SUBSTITUTE text/html # Original string inside an index.html : # Llamas are my favorite animals. # 1. Lookahead, OK # Expected : word 'favorite' changed: # Llamas are my f4vorite animals. Substitute "s/a(?=v)/4/" # 2. Lookbehind, not OK : nothing happens # Expected : word 'animals' changed: # Llamas are my favorite animAls. Substitute "s/a(?<=m)/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)/&/"# 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/" --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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