Encode and decode Uniform Resource Identifiers (URIs). URIs are used in internet transfer protocols. Valid URI characters consist of letters, digits, and the characters ;/?:@&=+$,-.!~*'() Reserved URI characters are ;/?:@&=+$, Escape sequences consist of % followed by two hex digits.
Decodes the URI string encodedURI into a UTF-8 string and returns it. Escape sequences that resolve to reserved URI characters are not replaced. Escape sequences that resolve to the '#' character are not replaced.
Decodes the URI string encodedURI into a UTF-8 string and returns it. All escape sequences are decoded.
Encodes the UTF-8 string uri into a URI and returns that URI. Any character not a valid URI character is escaped. The '#' character is not escaped.
Encodes the UTF-8 string uriComponent into a URI and returns that URI. Any character not a letter, digit, or one of -.!~*'() is escaped.
Does string s[] start with a URL?
Does string s[] start with an email address?