Ich versuche herauszufinden, diese Regex, die ich in PHP verwenden, aber ich bin ein Nooby so ist sehr schwierig für mich. Kannst du mir bitte erklären, was diese Regex macht?URL regulärer Ausdruck comprension
/(?:https?:\/\/)?(?:[a-zA-Z0-9.-]+?\.(?:[a-zA-Z])|\d+\.\d+\.\d+\.\d+)/
Vielen Dank!
Brackets
[0-9] - It matches any decimal digit from 0 through 9.
[a-z] - It matches any character from lower-case a through lowercase z.
[A-Z] - It matches any character from uppercase A through uppercase Z.
[a-Z] - It matches any character from lowercase a through uppercase Z.
Quantifiers
p+ - It matches any string containing at least one p.
p* - It matches any string containing zero or more p's.
p? - It matches any string containing zero or one p's.
p{N} - It matches any string containing a sequence of N p's
p{2,3} - It matches any string containing a sequence of two or three p's.
p{2, } - It matches any string containing a sequence of at least two p's.
p$ - It matches any string with p at the end of it.
^p - It matches any string with p at the beginning of it.
Expression & Description
[[:alpha:]] - It matches any string containing alphabetic characters aA through zZ.
[[:digit:]] - It matches any string containing numerical digits 0 through 9.
[[:alnum:]] - It matches any string containing alphanumeric characters aA through zZ and 0 through 9.
[[:space:]] - It matches any string containing a space.
Weitere Informationen Ansicht: Regex
Lese [diese] (https://www.tutorialspoint.com/php/php_regular_expression.htm) – Gahan
Warum verwenden Sie es? – TimBrownlaw
@TimBrownlaw Ich benutze es für die Validierung einer URL auf meinem Code, aber ich fand es im Internet und ich möchte genau wissen, was es tut. – Weit