To match one or more occurances of your \x1B character try using this string "\x20\x1B+\x0A".
The plus sign will make the RegEx engine match one or more of the preceding character.
So for a single pass you may use something like:
"\x20\x1B+\x0A|\x1B+"
In my initial testing the RegEx engine properly found the longer string first. Your milage may vary.
