Parse characters of a string??

Need a little help trying to figure out the correct way to parse some characters of a string.

var X = "This is a Test, SHP - 1"

I need to get all the characters after the "SHP - ". There will be spaces in that substring. "SHP(space)-(space)"

Here are a few problems where it makes it more difficult for me.
When same characters are involved such as the "-".
If var X = "This is - a test, SHP - 1234"

The "SHP - " will always be at the end of the strings. So basically I need everything after that last (space) in "SHP - ".

Thanks!

Try this:
Where 6 is the length of the search String

var X = "This is - a test, SHP - 1234";

/*--------------------------------
^ : string start
.* : any char sequence
--------------------------------*/
var digits = X.replace(/^.*SHP - /,'')

alert('|'+digits+'|')

That does it. Thanks!