[PHP] regexp for URL

[Mattia]

Does anyone have a good regular expression for capturing all http URL in 
a string?
now i'm using ?(http://[a-z0-9-/_;&=+-\.\?:@]+)\b?mi
in one of my programs, that is, all strings beginning with http:// and 
contain chars like a-z0-9 ...

does anione have something better?

thank you

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