Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:/(?:[0-9A-Za-z-]+/)*[&?=0-9A-Za-z-]*)?

?repeats the group contents below at most once:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:[0-9A-Za-z-]+/)*

*repeats the group contents below any number of times:

Character Class[0-9A-Za-z-]+

+matches at least one character from the set below:

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

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[&?=0-9A-Za-z-]*

*matches any number of characters from the set below:

&the literal & (38₁₀ / 46₈ / 26₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

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

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(?:/(?:[0-9A-Za-z-]+/)*[&?=0-9A-Za-z-]*)?$

New

SHOULD MATCH
/
/section
/section/article-1
/section/article-1/
/section/article-1?x=y&hello=world

SHOULD NOT MATCH
section/article-1
/section/!$*
/x(1)

Substitution

SHOULD MATCH
/
/section
/section/article-1
/section/article-1/
/section/article-1?x=y&hello=world

SHOULD NOT MATCH
section/article-1
/section/!$*
/x(1)