匹配VT100转义序列的Python regex

I'm writing a Python program that logs terminal interaction (similar to the script program), and I'd like to filter out the VT100 escape sequences before writing to disk. I'd like to use a function like this:

我正在编写一个记录终端交互(类似于脚本程序)的Python程序，我想在写入磁盘之前过滤掉VT100转义序列。我想用这样的函数:

def strip_escapes(buf):
    escape_regex = re.compile(???) # <--- this is what I'm looking for
    return escape_regex.sub('', buf)

What should go in escape_regex?

在escape_regex中应该做什么?

3 个解决方案

#1

The combined expression for escape sequences can be something generic like this:

转义序列的组合表达式可以是这样的:

(\x1b\[|\x9b)[^@-_]*[@-_]|\x1b[@-_]

Should be used with re.I

应该与rei一起使用

This incorporates:

这包括:

Two-byte sequences, i.e. \x1b followed by a character in the range of @ until _.
双字节序列，即\x1b，后面跟着一个字符，范围为@，直到_。
One-byte CSI, i.e. \x9b as opposed to \x1b + "[".
一个字节的CSI，也就是\x9b，而不是\x1b + "["。

However, this will not work for sequences that define key mappings or otherwise included strings wrapped in quotes.

但是，对于定义键映射或包含引号括起来的字符串的序列，这是行不通的。

#2

VT100 codes are already grouped(mostly) according to similar patterns here:

VT100代码已经(大部分)按照类似的模式分组:

http://ascii-table.com/ansi-escape-sequences-vt-100.php

http://ascii table.com/ansi -逃避-序列- vt - 100. - php

I think the simplest approach would be to use some tool like regexbuddy to define a regex for each VT100 codes group.

我认为最简单的方法是使用regexbuddy之类的工具为每个VT100代码组定义一个regex。

#3

I found the following solution to successfully parse vt100 color codes and remove the non-printable escape sequences. The code snippet found here successfully removed all codes for me when running a telnet session using telnetlib:

我找到了以下解决方案来成功解析vt100颜色代码并删除不可打印的转义序列。在使用telnetlib运行telnet会话时，这里找到的代码片段成功地为我删除了所有代码:

    def __processReadLine(self, line_p):
    '''
    remove non-printable characters from line <line_p>
    return a printable string.
    '''

    line, i, imax = '', 0, len(line_p)
    while i < imax:
        ac = ord(line_p[i])
        if (32<=ac<127) or ac in (9,10): # printable, \t, \n
            line += line_p[i]
        elif ac == 27:                   # remove coded sequences
            i += 1
            while i<imax and line_p[i].lower() not in 'abcdhsujkm':
                i += 1
        elif ac == 8 or (ac==13 and line and line[-1] == ' '): # backspace or EOL spacing
            if line:
                line = line[:-1]
        i += 1

    return line

#1