regex101: URL checker

Pro

1st Alternativehttp:\/\/(www\.[a-z0-9]+([\-\.][a-z0-9]+)*\.[a-z]{2,5})(:[0-9]{1,5})?(\/.*)?$

http:the literal text http: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1(www\.[a-z0-9]+([\-\.][a-z0-9]+)*\.[a-z]{2,5})

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z0-9]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 2([\-\.][a-z0-9]+)*

*repeats the group contents below any number of times:

Character Class[\-\.]

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z0-9]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,5}

{2,5}matches between 2 and 5 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group 3(:[0-9]{1,5})?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-9]{1,5}

{1,5}matches between 1 and 5 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 4(\/.*)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*any Unicode character (except for line terminators), repeated any number of times

$end of line

2nd Alternative^(\/.*)

^start of line

Group 5(\/.*)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*any Unicode character (except for line terminators), repeated any number of times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

http:\/\/(www\.[a-z0-9]+([\-\.][a-z0-9]+)*\.[a-z]{2,5})(:[0-9]{1,5})?(\/.*)?$|^(\/.*)

New

http://www.google.com
/~germain/CS4480
http://www.cs.utah.edu/~germain/CS4480 HTTP/1.1
http://www.cs.utah.edu/~germain/CS4480:8080 HTTP/1.1

http://www.cs.utah.edu:8080/~germain/CS4480

http://www.cs.utah.edu/~germain/CS4480

Substitution

http://www.google.com
/~germain/CS4480
http://www.cs.utah.edu/~germain/CS4480 HTTP/1.1
http://www.cs.utah.edu/~germain/CS4480:8080 HTTP/1.1

http://www.cs.utah.edu:8080/~germain/CS4480

http://www.cs.utah.edu/~germain/CS4480