REGEX URL正则表达式[重复]

Question

Possible Duplicate:
Regular expression for browser Url

Is this regex perfect for any url ?

preg_match_all(
 '/([www]+(\.|dot))?[a-zA-Z0-9_\.-]+(\.|dot){1,}[com|net|org|info\.]+((\.|dot){0,}[a-zA-Z]){0,}+/i', 
 $url, $regp);

Answer 1

[www]+ should be changed for (www)?

(\.|dot){1,} - one and more? mayby you wanted to do ([a-zA-Z0-9_\.-]+(\.|dot)){1,}