Regular Expressions 101

Pro

^start of line

users/the literal text users/ (case sensitive)

Group pk(?P<pk>\d+)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:/(?P<username>[-\w]+))?

?repeats the group contents below at most once:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group username(?P<username>[-\w]+)

Character Class[-\w]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\wa Unicode word character

Non-Capturing Group(?:/(?P<tab>[-\w]+))?

?repeats the group contents below at most once:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group tab(?P<tab>[-\w]+)

Character Class[-\w]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\wa Unicode word character

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

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

Detailed match information will be displayed here automatically.

25 tokens

^users/(?P<pk>\d+)(?:/(?P<username>[-\w]+))?(?:/(?P<tab>[-\w]+))?/?

New

users/24
users/24/
users/24/sam
users/24/sam/
users/24/sam/tab_name
users/24/sam/tab_name/

users/24
users/24/
users/24/sam
users/24/sam/
users/24/sam/tab_name
users/24/sam/tab_name/