Regular Expressions 101

Negative Lookbehind(?<!=|^)

1st Alternative=

=the literal = (61₁₀ / 75₈ / 3D₁₆)

2nd Alternative^

^start of line

Positive Lookahead(?=https?://)

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

://the literal text ://

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?://)

http://foo.barhttps://foo.bazhttp://foo.bar?url=http://foo.baz