JavaScript String.replace（）

Question

The following replacement

"index.html".replace('\.html$', '_fr.html');

returns "index.html", indicating that the first argument didn't match anything. However, if I remove the "$"

"index.html".replace('\.html', '_fr.html');

then the first argument matches and "index_fr.html" is returned.

Returning to the first example, can someone explain why ".html$" does not seem to match "index.html"?

Answer 1

Because that's not a regular expression - regex literals in JavaScript look like:

/\.html$/

without quotes. String.replace takes a string or a regular expression literal.