Regular Expressions 101

Non-Capturing Group(?:\/([a-z]{2})(?:\/([a-z]{2}_[A-Z]{2}))?)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

Character Class[a-z]{2}

{2}matches exactly 2 characters from the set below:

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

Non-Capturing Group(?:\/([a-z]{2}_[A-Z]{2}))?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2([a-z]{2}_[A-Z]{2})

Character Class[a-z]{2}

{2}matches exactly 2 characters from the set below:

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[A-Z]{2}

{2}matches exactly 2 characters from the set below:

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

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?:\/([a-z]{2})(?:\/([a-z]{2}_[A-Z]{2}))?)

New

test.com/en
test.com/en/en_US
test.com/es
test.com/es/es_ES