: Apache .htaccess mod_rewrite: use of [NC] I see tons of .htacces examples containing the [NC] flag (NoCase = case-insensitive) For example the famous h5bp page use the [NC] flag a lot: https://github.com/h5bp/server-config

@Ogunnowo487

But the Official documentation clearly states it is used only for the RewriteRule directive.


The docs don't say that it can only be used on the RewriteRule directive. The page you link to (which incidentally is specifically about the RewriteRule flags) simply states:


Use of the [NC] flag causes the RewriteRule to be matched in a case-insensitive manner.


The docs for the RewriteCond directive include a section on the flags that can be used with this directive. And these include NC, OR and NV. The NC flag is common to both directives.

If you did use an invalid flag on the RewriteCond directive you'll get a 500 Internal Server error.

However, (bit of an aside), the NC flag is used too much. People often include it by default, when it really isn't necessary (or worse, will actually cause problems).

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