Regular Expressions 101

Explanation
Pro

Non-Capturing Group(?:\?|\&)

1st Alternative\?

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

2nd Alternative\&

\&the literal & (38₁₀ / 46₈ / 26₁₆)

Group key(?<key>[\w]+)

Character Class[\w]+

+matches at least one character from the set below:

\wany word character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group value(?<value>[\w+,.-]+)

Character Class[\w+,.-]+

+matches at least one character from the set below:

\wany word character

+the literal + (43₁₀ / 53₈ / 2B₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\:?)

\:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

Group option(?<option>[\w,]*)

Character Class[\w,]*

*matches any number of characters from the set below:

\wany word character

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

(?:\?|\&)(?<key>[\w]+)=(?<value>[\w+,.-]+)(?:\:?)(?<option>[\w,]*)

New

css?v=1.0&display=screen

css?v=1.0&display=screen