i need the blank in 'From [' etc in order to distinguish it from the strings with 'From:' one solution to the problem, btw, is to use '\s' instead of a literal blank. does this behavior rank as a bug in perl?
tom arnall north spit, ca On Thursday 30 March 2006 05:15 am, Hans Meier (John Doe) wrote: > tom arnall am Donnerstag, 30. März 2006 12.36: > > the following code: > > > > my (@main); > > $_=" > > From a > > From: b > > From: c > > From: d > > "; > > @main = /From [^\n]*?\n.*?(From: .*?\n).*?/gx; > > print "@main"; > > print "------------------------------\n"; > > @main = /From [^\n]*?\n.*?(From: .*?\n).*?/g; > > print "@main"; > > > > produces: > > > > From: b > > From: d > > ------------------------------ > > From: b > > > > the only difference between the two regex lines is the 'x' after '/g' in > > the first of the two regex lines. > > indeed :-) > > And your question could be: Why does this produce different results? > > There's an additional difference on the semantic level: spaces in the 1st > regex are irrelevant. Look at the first regex space: in the 2nd regex, it > matches (only) in "From a", but not in "From: c", whereas the 1st regex > matches "From a" *and* "From: c". > > /From[^\n]*?\n.*?(From: .*?\n).*?/gx; > and > /From[^\n]*?\n.*?(From: .*?\n).*?/g; > produce both the same output. > > hth! > Hans -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
