Alexey Mishustin wrote:
1/18/2011, "Grant"<emailgr...@gmail.com> вы писали:
I came up with these but they don't seem to work reliably:
/\.google\..*\/imgres\?/
/\.google\..*\/images\?/
/\.google\..*\/products\?/
/(www.){0,1}(google\.).*\/(imgres)|(images)|(products)\?{0,1}/
That says:
(www.){0,1}
Match a four character string, beginning with 'www', zero or one time,
and store the match in $1
(google\.)
Match the string 'google.' and store it in $2, Why? We know it will
always be 'google.'.
.*\/
Match zero or more non-newline characters up to, and including, the last
'/' character.
(imgres)
Match 'imgres' and store it in $3. Why? We know it will always be
'imgres'.
(images)
Match 'images' and store it in $4. Why? We know it will always be
'images'.
(products)
Match 'products' and store it in $5. Why? We know it will always be
'products'.
\?{0,1}
Match a '?' character zero or one times.
And finally, you use alternation which says to match either:
(www.){0,1}(google\.).*\/(imgres)
OR:
(images)
OR:
(products)\?{0,1}
John
--
Any intelligent fool can make things bigger and
more complex... It takes a touch of genius -
and a lot of courage to move in the opposite
direction. -- Albert Einstein
--
To unsubscribe, e-mail: beginners-unsubscr...@perl.org
For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/
