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Old 17th April 2023, 10:32   #1  |  Link
LigH
German doom9/Gleitz SuMo
 
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Join Date: Oct 2001
Location: Germany, rural Altmark
Posts: 6,853
How to strip extended XTerm ANSI Escape sequences with RegEx?

In general, an ANSI Escape sequence is made of
  • the ESC character (ASCII 27 = 0x1B)
  • usually the [ character
  • optional number parameters, separated by ; semicola
  • usually one alphanumeric letter

These strings could be filtered with a regular expression substitution for e.g. sed like:

Code:
s/\x1b\[[0-9;]*[a-zA-Z]//g
But ... XTerm (in mintty) supports a few more custom extensions which do not only start with the common [, some also start with ] or (.

I tried several ways to substitute the \[ with a list of \[, \] and \(, but I can't get it working correctly...

If you want to test a solution you would like to recommend, here is a small sample.
__

PS: Some progress ... I could combine patterns starting with ESC and ([ or () using

Code:
s/\x1b[[(][0-9;]*[a-zA-Z]//g
But I'm still missing the ESC ]0; pattern as alternative, which does not close with an alphanumeric letter.
__

PPS: I believe I got it.

The pipe | needs to be escaped to be recognised as logical OR inside the sed parameter, but only in the live editor; in a shell script it doesn't.

Code:
s/\x1b[[(][0-9;]*[a-zA-Z]|\x1b\][0-9];//g
Thanks to the GNU sed live editor
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Last edited by LigH; 17th April 2023 at 12:18.
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