Regular Expressions 101

Explanation

Pro

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1([a-z0-9]+\.)+

+repeats the group contents below at least once:

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)

Group 2(at|de|ch)

1st Alternativeat

atthe literal text at (case sensitive)

2nd Alternativede

dethe literal text de (case sensitive)

3rd Alternativech

chthe literal text ch (case sensitive)

Group 3(\/[a-z]+)*

*repeats the group contents below any number of times:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[a-z]+

+matches at least one character from the set below:

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

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 4(\?[a-z]+=[a-z]*(&[a-z]+=[a-z]*)*)?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Character Class[a-z]+

+matches at least one character from the set below:

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

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[a-z]*

*matches any number of characters from the set below:

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

Group 5(&[a-z]+=[a-z]*)*

*repeats the group contents below any number of times:

&the literal & (38₁₀ / 46₈ / 26₁₆)

Character Class[a-z]+

+matches at least one character from the set below:

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

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[a-z]*

*matches any number of characters from the set below:

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

Global pattern flags

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

https?:\/\/([a-z0-9]+\.)+(at|de|ch)(\/[a-z]+)*\/?(\?[a-z]+=[a-z]*(&[a-z]+=[a-z]*)*)?

New

http://a1.at
http://orf.at/
https://tc.tugraz.at/main
http://www.derstandard.at/kultur/
https://wikipedia.at/wiki/regex/
http://duckduckgo.at/?q=regex
https://gdi.ist.tugraz.at?user=student
http://gdi.ist.tugraz.at/login?course=gdi&role=student
http://tugraz.at?emptyparam=

ε (Leerstring)
http
http://
http://www
http://.at
http://orf.at//
https://de.wikipedia.org
http://tugraz.at/?
http://gdi.ist.tugraz.at/?user=student&
http://?user=student
https://tugraz.at?user