Bug: Regular Expressions [^\v]* not working as expected

Sebastian Proske

When I use search with regular expressions, I would expect [^\v]* to match a whole line until the linebreak - but it matches the whole document. However \v works fine, as does \V - am I expecting wrong or is this a bug?

Claudia Frank

Hello @Sebastian-Proske,

seems that \v is used for vertivcal tab.

Cheers
Claudia

guy038

Hello Sebastian,

First of all, sorry for my late reply :-(

There a particularity of the BOOST Regex ligrary, about the regex syntax \v :

The regex \v represents any vertical blank character, that is to say one character which belongs to the range [\n\x0B\f\r]
The regex [\v] represents, ONLY, the vertical tabulation character, of Unicode code \x0B

So, when you write [^\v], it matches any single character, which is different from the \x0b ( VT character )

Thus, your regex [^\v]* represents any set, even empty, of characters, different from the Vertical Tabulation character, included any End Of Line character ( \r, \n or \r\n)

In other words, if your current file does NOT contain any \x0b character, your regex [^\v]* matches, absolutely, all the characters of the file. Quite logical !

Best Regards,

guy038

P.S. :

The regex \V ( Uppercase v ) is equivalent to the range [^\n\x0B\f\r], that is to say any single character, different from a Vertical Tabulation, from a Form Feed character and from an EOL character.

Again, if your file does NOT contain any \x0b and/or \x0c character(s), the regex \V+ matches successively, each whole line, without its line break !