Regex in Python. NOT matches?

As to making the matching case insensitive, you can use the I or IGNORECASE flags from the re module, for example when compiling your regex: regex = re. Compile("^a-zÄ…Ä? ęėįšųūž+_\d+$", re.

I) As to removing the lines not matching this regex, you can simply construct a new string consisting of the lines that do match: new_s = "\n". Join(line for line in s. Split("\n") if re.

Match(regex, line)).

As to making the matching case insensitive, you can use the I or IGNORECASE flags from the re module, for example when compiling your regex: regex = re. Compile("^a-ząĝęėįšųūž+_\d+$", re. I) As to removing the lines not matching this regex, you can simply construct a new string consisting of the lines that do match: new_s = "\n".

Join(line for line in s. Split("\n") if re. Match(regex, line)).

First of all, given your example inputs, every line ends with underscore + integers, so all you really need to do is invert the original match. If the example wasn't really representative, then inverting the match could land you results like this: abcdefg_nodigitshere But you can subfilter that this way: import re mydigre = re. Compile(r'_\d+$') myreg = re.

Compile(r'^a-ząĝęėįšųūž+_\d+$', re. I) for line in inputs.splitlines(): if re. Match(myreg, line): # do x elif re.

Match(mydigre, line): # do y else: # line doesn't end with _\d+ Another option would be to use Python sets. This approach only makes sense if all your lines are unique (or if you don't mind eliminating duplicate lines) and you don't care about order. It probably has a high memory cost, too, but is likely to be fast.

All_lines = set(line for line in inputs.splitlines()) alpha_lines = set(line for line in all_lines if re. Match(myreg, line)) nonalpha_lines = all_lines - alpha_lines nonalpha_digi_lines = set(line for line in nonalpha_lines if re. Match(mydigire, line)).

Not sure how python does modifiers, but to edit in-place, use something like this (case insensitive): edit Note that some of these characters are utf8. To use the literal representation your editor and language must support this, otherwise use the \u.. code in the character class (recommended). S/(?i)^(?!

A-ząĝęėįšųūž+_\d+(?:\n|$)). *(?:\n|$)//mg; where the regex is: r'(?i)^(?! A-ząĝęėįšųūž+_\d+(?:\n|$)).

*(?:\n|$)' the replacement is '' modifier is multiline and global. Breakdown: modifiers are global and multiline (?i) // case insensitive flag ^ // start of line (?! A-ząĝęėįšųūž+_\d+(?:\n|$)) // look ahead, not this form of a line?.

* // ok then select all except newline or eos (?:\n|$) // select newline or end of string.

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