Regular Expressions 101

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

imgthe literal text img (case sensitive)

Non-Capturing Group(?:\].+\[\/img\]|=.+\])

1st Alternative\].+\[\/img\]

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

.+any character (except for line terminators), repeated at least once

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

imgthe literal text img (case sensitive)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative=.+\]

=the literal = (61₁₀ / 75₈ / 3D₁₆)

.+any character (except for line terminators), repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

$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.

Search reference

Regular Expression

^\[img(?:\].+\[\/img\]|=.+\])$

New

[img]https://example.com/image.jpg[/img]
[img=https://example.com/image.jpg]