Python and binary data in regexps

Question

I am looking for a way of putting non-printable characters in a string in python.

Small background information: I am working with windows command prompt over SSH using paramiko. however paramiko does not 'parse'/'work with' the ANSI Terminal Emulation escape sequences. So they are appearing in my output, which I do not want. So I need to strip-off these escape sequences.

These strings/escape sequences however are encoded in the following manner: Esc[Line;ColumnH

And as you can guess. I can't get the esc-byte value in a string. It will either print as, well, something like 0x1b or 27. Thus useless.

Is there anyone who knows how to solve this? Thanks in advance.

Escape the non-ascii characters (by replacing with literals), do regex magic, un-escape? — Kos
– Kos, Commented Mar 5, 2012 at 11:56
with many applications, setting environment variable TERM=dumb will prevent them from sending ANSI escape sequences. — Paulo Scardine
– Paulo Scardine, Commented Mar 5, 2012 at 12:35

Xion345 · Accepted Answer · 2012-03-05 12:20:43Z

1

You can suppress these escape sequences using regex :

str_with_ainsi_esc = '\x1b[10;10HSalut'
print re.sub('\x1b\[\d+;\d+H','',str_with_ainsi_esc)

answered Mar 5, 2012 at 12:20

Xion345

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2 Comments

Daan Timmer Over a year ago

Ahh, so that is how you put byte-chars in a string. Thanks. Will take a closer look tomorrow. (home-time now)

Daan Timmer Over a year ago

I did change '\x1b\[\d+;\d+H' to '\x1b\[\d*;\d*H' because both the column and row value are optional according to the VT100 spec.

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