Regular Expressions 101

^start of string

Group 1((LABEL ([a-z]([[a-z]|[\d])|\d{0,4}))(\, ([a-z]([[a-z]|[\d])|\d{0,4}))*)

Group 2(LABEL ([a-z]([[a-z]|[\d])|\d{0,4}))

LABEL the literal text LABEL (case sensitive)

Group 3([a-z]([[a-z]|[\d])|\d{0,4})

1st Alternative[a-z]([[a-z]|[\d])

Character Class[a-z]

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

Group 4([[a-z]|[\d])

1st Alternative[[a-z]

Character Class[[a-z]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

2nd Alternative[\d]

Character Class[\d]

\da digit

2nd Alternative\d{0,4}

\d{0,4}a digit, repeated between 0 and 4 times

Group 5(\, ([a-z]([[a-z]|[\d])|\d{0,4}))*

*repeats the group contents below any number of times:

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group 6([a-z]([[a-z]|[\d])|\d{0,4})

1st Alternative[a-z]([[a-z]|[\d])

Character Class[a-z]

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

Group 7([[a-z]|[\d])

1st Alternative[[a-z]

Character Class[[a-z]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

2nd Alternative[\d]

Character Class[\d]

\da digit

2nd Alternative\d{0,4}

\d{0,4}a digit, repeated between 0 and 4 times

$end of string, or before its final line terminator

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

^((LABEL ([a-z]([[a-z]|[\d])|\d{0,4}))(\, ([a-z]([[a-z]|[\d])|\d{0,4}))*)$

New

LABEL 3333, 5434, d4