Regular Expressions 101

^start of string

Group 1(http:\/\/)?

?repeats the group contents below at most once:

http:the literal text http: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2([\da-z\.-]+)

Character Class[\da-z\.-]+

+matches at least one character from the set below:

\da digit

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3([[\/\w \.-]*]*\/?)

Character Class[[\/\w \.-]*

*matches any number of characters from the set below:

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\wany word character

the literal (32₁₀ / 40₈ / 20₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

]*the literal ] (93₁₀ / 135₈ / 5D₁₆) , repeated any number of times

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

Group 4(\?{1}continue={1})

\?{1}the literal ? (63₁₀ / 77₈ / 3F₁₆) , repeated exactly 1 time

continuethe literal text continue (case sensitive)

={1}the literal = (61₁₀ / 75₈ / 3D₁₆) , repeated exactly 1 time

Group 5(https?%3A|a)

1st Alternativehttps?%3A

httpthe literal text http (case sensitive)

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

%3Athe literal text %3A (case sensitive)

2nd Alternativea

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

Group 6([%=\d\w\.\/-_]*)

Character Class[%=\d\w\.\/-_]*

*matches any number of characters from the set below:

%the literal % (37₁₀ / 45₈ / 25₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\da digit

\wany word character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/-_one character from / (47₁₀) to _ (95₁₀)

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(http:\/\/)?([\da-z\.-]+)([[\/\w \.-]*]*\/?)(\?{1}continue={1})(https?%3A|a)([%=\d\w\.\/-_]*)$

Test String
New

http://dev.finit.io/_ah/login?continue=http%3A%2F%2Fdev.finit.io%2Fh

Regular Expression

Test StringNew

Test String
New