Javascript - how to replace a sub-string?

Question

This is a simple one. I want to replace a sub-string with another sub-string on client-side using Javascript.

Original string is \'original READ ONLY\'

Answer 1

I prefer the regex approach,

newstring = oldstring.replace(/regexforstringtoreplace/, 'new string');

its also worth considering the g and i regex modifiers, these do a global replace (i.e. replaces all occurrences) and makes it case insensitive.

for example: