Todas estas reglas de RFC3986 se reproducen en la tabla 2 junto con una implementación de expresión regular para cada regla.
Una aplicación Javascript esto está disponible aquí: https://github.com/jhermsmeier/uri.regex
Como referencia, la expresión regular URI se repite a continuación:
# RFC-3986 URI component: URI
[A-Za-z][A-Za-z0-9+\-.]* : # scheme ":"
(?: // # hier-part
(?: (?:[A-Za-z0-9\-._~!$&'()*+,;=:]|%[0-9A-Fa-f]{2})* @)?
(?:
\[
(?:
(?:
(?: (?:[0-9A-Fa-f]{1,4}:) {6}
| :: (?:[0-9A-Fa-f]{1,4}:) {5}
| (?: [0-9A-Fa-f]{1,4})? :: (?:[0-9A-Fa-f]{1,4}:) {4}
| (?: (?:[0-9A-Fa-f]{1,4}:){0,1} [0-9A-Fa-f]{1,4})? :: (?:[0-9A-Fa-f]{1,4}:) {3}
| (?: (?:[0-9A-Fa-f]{1,4}:){0,2} [0-9A-Fa-f]{1,4})? :: (?:[0-9A-Fa-f]{1,4}:) {2}
| (?: (?:[0-9A-Fa-f]{1,4}:){0,3} [0-9A-Fa-f]{1,4})? :: [0-9A-Fa-f]{1,4}:
| (?: (?:[0-9A-Fa-f]{1,4}:){0,4} [0-9A-Fa-f]{1,4})? ::
) (?:
[0-9A-Fa-f]{1,4} : [0-9A-Fa-f]{1,4}
| (?: (?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) \.){3}
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
)
| (?: (?:[0-9A-Fa-f]{1,4}:){0,5} [0-9A-Fa-f]{1,4})? :: [0-9A-Fa-f]{1,4}
| (?: (?:[0-9A-Fa-f]{1,4}:){0,6} [0-9A-Fa-f]{1,4})? ::
)
| [Vv][0-9A-Fa-f]+\.[A-Za-z0-9\-._~!$&'()*+,;=:]+
)
\]
| (?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
| (?:[A-Za-z0-9\-._~!$&'()*+,;=]|%[0-9A-Fa-f]{2})*
)
(?: : [0-9]*)?
(?:/ (?:[A-Za-z0-9\-._~!$&'()*+,;=:@]|%[0-9A-Fa-f]{2})*)*
|/
(?: (?:[A-Za-z0-9\-._~!$&'()*+,;=:@]|%[0-9A-Fa-f]{2})+
(?:/ (?:[A-Za-z0-9\-._~!$&'()*+,;=:@]|%[0-9A-Fa-f]{2})*)*
)?
| (?:[A-Za-z0-9\-._~!$&'()*+,;=:@]|%[0-9A-Fa-f]{2})+
(?:/ (?:[A-Za-z0-9\-._~!$&'()*+,;=:@]|%[0-9A-Fa-f]{2})*)*
|
)
(?:\? (?:[A-Za-z0-9\-._~!$&'()*+,;=:@/?]|%[0-9A-Fa-f]{2})*)? # [ "?" query ]
(?:\# (?:[A-Za-z0-9\-._~!$&'()*+,;=:@/?]|%[0-9A-Fa-f]{2})*)? # [ "#" fragment ]
Usé este truco en PHP. Para los programadores de PHP, consulte aquí: https://stackoverflow.com/questions/206059/php-validation-regex-for-url –