On Sun, Jun 27, 2010 at 10:52 PM, Oron Peled <[email protected]> wrote:
> Hi, > > First a short answer to Guy -- 'col -b' won't help because it removes the > meta sequences of backspaces (that's what the 'b' stands for) used in > Unix/Linux manuals (cat pages FWIW). These sequences were used as a > neutral format that is later translated to terminal specific escape > sequences by programs such as more/less etc. > > On Sunday, 27 בJune 2010 12:08:09 Erez David wrote: > > s/\e[\[01]m//g does't do the job. since the first [ is not a real > character > > it is a meta character... > > Not exactly. The sequences presented are part of ANSI standard of escape > sequences used to highlight text (bold/underline/etc) on terminals. > So we don't talk about a special character, but a special *strings*. > > All these sequences have a common form. The simplest format is: > > <ESCAPE>[<numeric_code>m > > The ASCII code of ESC (decimal 27 as mentioned by someone else here) is > commonly written as ^[ (control+left bracket) because this is actually > the ASCII number of this character. > > BTW: if the escape key in your keyboard is broken, you can use control+left > bracket as a substitute because it is really the same character. > > The result of this is that when writing the sequence as text, it is often > presented as: ^[[2m > > But note that the first bracket is part of "control+bracket" which simply > means the escape character, and the second bracket is the real '[' > character which is part of the sequence (the length of the example above > is exactly 4 characters) > > Now you should see the problem with your regex -- the '[' in a regex means > open a character class.... so it is special character for regex. > A correct regex should be: > s/\e\[\d+m// > But this also has an error because it's greedy. Let's fix it: > s/\e\[\d+?m// > > Well, he said s/\e[\[01]m//g And I thought he actually ment s/\e\[[01]m//g which is just a minor typo and should actually capture the examples given by the original poster. (Well, I'm no expert shlomifologist---it just seemed a more probable explanation...) :-) AA
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