On Mon, Jun 17, 2013 at 4:54 PM, Paul Isambert <[email protected]> wrote:
> luigi scarso <[email protected]> a écrit: > > On Mon, Jun 17, 2013 at 2:43 PM, Paul Isambert <[email protected]> > wrote: > > > > > Hello all, > > > > > > This is not really a LuaTeX question, but I ask it here anyway since a > > > lot of knowledgeable people read this list. > > > > > > I’ve been surprised to discover that > > > > > > print(string.gsub('abc', '.*', '(%0)')) > > > > > > returns > > > > > > (abc)() > > > > > > (similarly, “string.gmatch('abc', '.*')” returns two matches). I’d > > > expect > > > > > > (abc) > > > > > > > > > > myabe this can help > > > > > print(string.gsub("abc","%s*","(%0)")) > > ()a()b()c() 4 > > > > > print(string.gsub("abc","%S*","(%0)")) > > (abc)() 2 > > > > """ > > A pattern item can be > > > > a single character class followed by '*', which matches 0 or more > > repetitions of characters in the class. These repetition items will > always > > match the longest possible sequence; > > """ > > Thank you Luigi, but “*” has the same definition in other languages, > including those where there is no match on a final empty string. > > As for your first example, all languages behave the same as far as I > can tell, as expected. > > Best, > Paul > > $ perl -e '$x="abc"; @w=($x=~ /(.*)/g); print "tot. matches:", scalar(@w), " matches:($w[0])($w[1])\n"' tot. matches:2 matches:(abc)() $ perl -e '$x="abc"; @w=($x=~ /(.*)/); print "tot. matches:", scalar(@w), " matches:($w[0])($w[1])\n"' tot. matches:1 matches:(abc)() in perl "the modifier //g stands for global matching and allows the matching operator to match within a string as many times as possible" and I think it corresponds to "These repetition items will always match the longest possible sequence;" of pattern. -- luigi
