regex - What's the use of "?!" in this RewriteCond? -


this question has answer here:

i see ?! combination in rewritecond given in .htaccess files, this: 

rewritecond %{request_uri} ^(?!/slim_demo/index\.php).*$

to understanding, directive checks if /slim_demo/index.php isn't part of request_uri. odd; use of ? @ front, when has no preceding character match. documentation says ? "makes match optional", thing preceding ? grouping bracket. mean ? making grouping optional? makes sense!

what mystery?

negative lookahead after match: \d+(?!\d| dollars) sample match: 100 in 100 pesos explanation: \d+ matches 100, negative lookahead (?! dollars) asserts @ position in string, follows neither digit nor characters " dollars"


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