I'm writing some Python tests for a console application that uses console codes, and I'm having some problem gracefully handling the ESC H sequence.
I have the s = r'\x1b[12;5H\nSomething' input string, I'd like to replace it with Something. I'm trying to use the following regex:
re.sub(r'\x1b\[([0-9,A-Z]{1,2};([0-9]{1,2})H)', r'\2', s)
Which of course creates 5Something.
What I want is something to the effect of
re.sub(r'\x1b\[([0-9,A-Z]{1,2};([0-9]{1,2})H)', ' '*(int(r'\2')-1), s)
Which is to create one less than the number of spaces of the second capture group.
I'd also be very happy if there was a way to simply render in a string what I get when I use print(s):
Something
I'm using Python 3.
Thanks a lot!!
Use
import re
s = r'\x1b[12;5H\nSomething'
pattern = r'\\x1b\[[0-9A-Z]{1,2};([0-9]{1,2})H\\n'
print(re.sub(pattern, lambda x: ' '*(int(x.group(1))-1), s))
See Python proof. See a regex proof.
EXPLANATION
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\\ '\'
--------------------------------------------------------------------------------
x1b 'x1b'
--------------------------------------------------------------------------------
\[ '['
--------------------------------------------------------------------------------
[0-9A-Z]{1,2} any character of: '0' to '9', 'A' to 'Z'
(between 1 and 2 times (matching the most
amount possible))
--------------------------------------------------------------------------------
; ';'
--------------------------------------------------------------------------------
( group and capture to \1:
--------------------------------------------------------------------------------
[0-9]{1,2} any character of: '0' to '9' (between 1
and 2 times (matching the most amount
possible))
--------------------------------------------------------------------------------
) end of \1
--------------------------------------------------------------------------------
H 'H'
--------------------------------------------------------------------------------
\\ '\'
--------------------------------------------------------------------------------
n 'n'