Hello, Chris Dennis <cgden...@btinternet.com> writes:
> Hello Guile People > > Is there a way to make Guile regular expressions less greedy? I > understand that POSIX doesn't define non-greedy modifiers. > > Specifically, I'm trying to parse font names such as > > Arial 12 > Arial Bold Italic 14 > Nimbus Sans L Bold Italic Condensed 11 > > so that I can construct CSS styles from them. > > I've tried the following, but the first (.*) gobbles up everything > before the size because the other elements are optional: > > (define s (string-match "(.*)( +(bold|semi-bold|regular|light))?( > +(italic|oblique))?( +(condensed))? +([0-9]+)" "nimbus sans l bold > italic condensed 11")) Here's a possible solution: --8<---------------cut here---------------start------------->8--- scheme@(guile-user)> (define rx (make-regexp "^([^ ]+)( +(bold|semi-bold|regular|light))?( +(italic|oblique))?( +(condensed))? +([0-9]+)" regexp/extended)) scheme@(guile-user)> (define m (regexp-exec rx "nimbus bold italic condensed 11")) scheme@(guile-user)> (match:substring m 1) "nimbus" scheme@(guile-user)> (match:substring m 2) " bold" scheme@(guile-user)> (match:substring m 3) "bold" scheme@(guile-user)> (match:substring m 4) " italic" scheme@(guile-user)> (match:substring m 5) "italic" --8<---------------cut here---------------end--------------->8--- Note that I slightly modified the string that's matched because "sans" and "l" are not meant to be matched. Hope this helps, Ludo'.
