Regular Expressions 101

Character Class[&?]

&the literal & (38₁₀ / 46₈ / 26₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

tags=the literal text tags= (case sensitive)

Group 1([^&\n-]*(?:-[^&\n-]+)*)

Negated Character Class[^&\n-]*

*matches any number of characters outside the set below:

&the literal & (38₁₀ / 46₈ / 26₁₆)

\na line-feed (newline) character (ASCII 10)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:-[^&\n-]+)*

*repeats the group contents below any number of times:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negated Character Class[^&\n-]+

+matches at least one character outside the set below:

&the literal & (38₁₀ / 46₈ / 26₁₆)

\na line-feed (newline) character (ASCII 10)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:--(\d+))?

?repeats the group contents below at most once:

--the literal text --

Group 2(\d+)

\d+a digit, repeated at least once

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

[&?]tags=([^&\n-]*(?:-[^&\n-]+)*)(?:--(\d+))?

New

http://localhost:30001/catalog/search?tags=bed-green-big-33-22-ancient-5--2
http://localhost:30001/catalog/search?tags=bed-green-big-33-22-ancient-5
http://localhost:30001/catalog/search?more1=eee&tags=bed-green-big-33-22-ancient-5--4&gh=1

Regular Expression

Extraction