Regular Expressions 101

Pro

Positive Lookahead(?=.{0,3}\/\/.{0,100}[a-zA-Z0-9])

.{0,3}any character (except for line terminators), repeated between 0 and 3 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.{0,100}any character (except for line terminators), repeated between 0 and 100 times

Character Class[a-zA-Z0-9]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Positive Lookahead(?=\S+$)

\S+any non-whitespace character, repeated at least once

$end of line

.{2,5000}any character (except for line terminators), repeated between 2 and 5000 times

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

No unit tests · Add a test to get started

25 tokens

(?=.{0,3}\/\/.{0,100}[a-zA-Z0-9])(?=\S+$).{2,5000}

There are no unit tests, click to add some.