REGEX-Escape for: http://www.w3.org/2001/XMLSchema

Your Input:
Result, the escaped string:
http\:\/\/www\.w3\.org\/2001\/XMLSchema

What must the escaping look like for:
http://www.w3.org/2001/XMLSchema

The excaped text for use in a regex is:
http\:\/\/www\.w3\.org\/2001\/XMLSchema