-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Many thanks to all who responded. I have been reviewing the code examples sent to me and I will work to incorporate them into the next iteration of the program. It's rather funny to me that my 30+ lines of code we're reduced to about 4 with some regex's and a small if statement. Shows I have a long way to go, but it's been fun so far.
On Thursday 29 May 2003 11:36, Rob Dixon wrote: > Hi Chris. > > Please post to the list rather than directly to me. That > way you should get an answer of some sort even if I don't > get to it myself. Thanks. > > Chris Zimmerman wrote: > > Hash: SHA1 > > > > while ( $tmpfile =~ /([^,\s]+):([^,\s]+)/g ) > > > > Can you help me understand this regex? I know the first [ ] is $1 and > > the second is $2, but I am at a loss to see what this does. > > Nearly right, but the first ( .. ) demarks $1 and the second one > demarks $2. The parts enclosed by the sqaure brackets are character > classes > > [^,\s] > > The circumflex '^' negates the class (so that the class will match > 'not any of the following characters'). Then it's just a comma and > \s, which matches any 'whitespace' character - tab, linefeed, > formfeed, carriage-return and space. The character class will > therefore match anything which is neither whitespace nor a comma. > > So the complete regex > > [^,\s]+:[^,\s]+ > > will match two strings of one or more such characters separated > by a colon. The two pairs of parentheses capture the strings > before and after the colon, which should be the email address and > the file name. Adding the \s into the character class makes the > regex immune to spaces around the separating commas, as well as > discarding any trailing spaces and the newline at the end of each > config record. > > Finally the /g modifier in scalar context (which it is, as the > conditional expression of a 'while' statement) makes the regex > match just once each time it is executed. It attempts the match > from the point in the string where the previous match left off. > This makes it capture one mail address/file name pair for each > time through the 'while' block. > > I hope this is clear. > > Rob -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE+1kZtkXvEbfjFKqoRAp8LAJ9Bb3wh2OpniHfXwv8yKUJ8LaypEwCghzqi GpK0c1ktFaJiPmRL8x5hkDY= =/K3B -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
