Regular Expressions 101

^start of line

https:the literal text https: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1([a-z]{0,2})

Character Class[a-z]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

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

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

blahthe literal text blah (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

Non-Capturing Group(?:\/)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(.*)?

?repeats the group contents below at most once:

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

requiredthe literal text required (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Bthe literal B (66₁₀ / 102₈ / 42₁₆) (case sensitive)

Group 3([A-Z0-9]{9})

Character Class[A-Z0-9]{9}

{9}matches exactly 9 characters from the set below:

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

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^https:\/\/([a-z]{0,2})\.?blah\.com(?:\/)?(.*)?\/required\/B([A-Z0-9]{9}).*

https://blah.com/required/B7BG0Z0GU1A
https://blah.com/optional/required/B7BG0Z0GU1A