On Sun, Jun 16, 2019 at 08:16:29PM +0300, Abdulrahman Semrie wrote: > > I am using the pattern [\\[\\]a-zA-Z]+ to match a string with left or right > bracket in it. However, the string-match function doesn’t match the ‘]’ > character. To demonstrate with an example, try the following funciton: > > (string-match "[\\[\\]a-zA-Z]+" "Text[ab]”) > > The result for the above function should have been a match structure with > Text[ab] matched. However, the string-match returns #f which is incorrect. To > test if the pattern I am using was right, I tried on regex101.com and it > works. Here (https://regex101.com/r/VAl6aI/1) is the link that demonstrates > that it works. > > Hence, the above leads me to believe there is a bug in the regex library that > mishandles ] character in character-classes
If I understood you correctly, you are using POSIX regular expressions. Within a bracket expression ([...]), you can't escape ']' with a backslash. Just put the ] as first character, like so: [][a-zA-Z] Quoting the man page (regex(7)): A bracket expression is a list of characters enclosed in "[]". It normally matches any single character from the list (but see below). If the list begins with '^', it matches any single character (but see below) not from the rest of the list. [...] To include a literal ']' in the list, make it the first character (following a possible '^'). To include a literal '-', make it the first or last character, or the second endpoint of a range [...] See also [1], but the man page is more complete. (I'm assuming your Guile is linked against some POSIX regex library). Cheers -- t
signature.asc
Description: Digital signature
