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Why don't you just get rid of the stuff in front of the stuff? I.e., assume its "bad" and put "http://" in front of it? Or for that matter just leave the http:// off once you've done step (1).
#!/usr/bin/perl -w use strict; my @urls = ('tp://' , '://', 'http//', ''); foreach (@urls) { s/^.*?www/www/; print "http://$_\n"; } __END__ prints:
Update: well, this could be more complex as a valid URL does not have to start with www, it could be, then I guess you would want: It helps if you present a representative set of test cases.

It also helps if you can say something about the context of the application. Here I suppose you are trying to "guess" the user's intention of a manually entered URL? And then auto-magically "fix" it? Sometimes it is better to just try to use what the user entered and if it doesn't work, present an error message about what is acceptable for a URL.

Just another regex example... I'm sure that other monks can provide even better regex'es, but specifying the problem as clearly as you can is important.

my @urls = ('tp://' , '://', 'http//', '', '', 'http//', ''); foreach (@urls) { s/^(.*?)(\w+\.)/$2/; print "http://$_\n"; } __END__ prints:

In reply to Re: What is missing from the beginning of this string? by Marshall
in thread What is missing from the beginning of this string? by japhy

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