Negative lookahead Regular Expression

Question

I want to match all strings ending in \".htm\" unless it ends in \"foo.htm\". I\'m generally decent with regular expressions, but negative lookaheads have me stumped. Why

Answer 1

As mentioned JavaScript does not support negative look-behind assertions.

But you could use a workaroud:

/(foo)?\.htm$/i.test("/foo.htm") && RegExp.$1 != "foo";

This will match everything that ends with .htm but it will store "foo" into RegExp.$1 if it matches foo.htm, so you can handle it separately.