Regular Expressions 101

Positive Lookbehind(?<=twitter.com\/)

twitterthe literal text twitter (case sensitive)

.any Unicode character (except for line terminators)

comthe literal text com (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negated Character Class[^?\s]+

+matches at least one character outside the set below:

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\sa Unicode whitespace character

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

(?<=twitter.com\/)[^?\s]+

New

https://twitter.com/test1

http://twitter.com/test2

https://www.twitter.com/test3?

https://www.mobile.twitter.com/test4

https://www.twitter.com/test5?lang=en

https://www.instagram.com/test1insta

Regular Expression

Substitution