JavaScript相当于PHP的preg_replace

I am using a simple regex to replace break tags with newlines:

br_regex = /<br>/;
input_content = input_content.replace(br_regex, "
");

This only replaces the first instance of a break tag, but I need to replace all. preg_match_all() would do the trick in PHP, but I'd like to know the JavaScript equivalent.

Use the global flag, g:

foo.replace(/<br>/g,"
")

JS idiom for non-Regexp global replace:

input_content.split('<br>').join('
')