Regular Expressions 101

Explanation

Pro

^start of line

otpauth:the literal text otpauth: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

totpthe literal text totp (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1([A-Za-z0-9%]+)

Character Class[A-Za-z0-9%]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

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

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

%the literal % (37₁₀ / 45₈ / 25₁₆)

Group 2(\?issuer=[A-Za-z0-9%]+&secret=[A-Z2-7]+=*&algorithm=(SHA1|SHA256|SHA512)&digits=\d{6}&period=\d{2})?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

issuer=the literal text issuer= (case sensitive)

Character Class[A-Za-z0-9%]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

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

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

%the literal % (37₁₀ / 45₈ / 25₁₆)

&secret=the literal text &secret= (case sensitive)

Character Class[A-Z2-7]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

2-7one character from 2 (50₁₀) to 7 (55₁₀)

=*the literal = (61₁₀ / 75₈ / 3D₁₆) , repeated any number of times

&algorithm=the literal text &algorithm= (case sensitive)

Group 3(SHA1|SHA256|SHA512)

1st AlternativeSHA1

SHA1the literal text SHA1 (case sensitive)

2nd AlternativeSHA256

SHA256the literal text SHA256 (case sensitive)

3rd AlternativeSHA512

SHA512the literal text SHA512 (case sensitive)

&digits=the literal text &digits= (case sensitive)

\d{6}a digit, repeated exactly 6 times

&period=the literal text &period= (case sensitive)

\d{2}a digit, repeated exactly 2 times

$end of line

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

26 tokens

Regular Expression

^otpauth:\/\/totp\/([A-Za-z0-9%]+)(\?issuer=[A-Za-z0-9%]+&secret=[A-Z2-7]+=*&algorithm=(SHA1|SHA256|SHA512)&digits=\d{6}&period=\d{2})?$

New

otpauth://totp/TestLabel%3A?issuer=Test%20Issuer&secret=I65VU7K5ZQL7WB4E&algorithm=SHA1&digits=6&period=30

Extraction

otpauth://totp/TestLabel%3A?issuer=Test%20Issuer&secret=I65VU7K5ZQL7WB4E&algorithm=SHA1&digits=6&period=30