Regular Expressions 101

Group 1(https:\/\/.*?\.png(?!\S*\[)(?:\?[\w&=_-]*)?)

https:the literal text https: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.*?any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

pngthe literal text png (case sensitive)

Negative Lookahead(?!\S*\[)

\S*any non-whitespace character, repeated any number of times

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Non-Capturing Group(?:\?[\w&=_-]*)?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Character Class[\w&=_-]*

*matches any number of characters from the set below:

\wany word character

&the literal & (38₁₀ / 46₈ / 26₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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.

Search reference

Regular Expression

(https:\/\/.*?\.png(?!\S*\[)(?:\?[\w&=_-]*)?)

New

[img]https://test.com/cat.png?pkey=abcd[/img]
https://test.com/cat.png?pkey=abcd