Regular Expressions 101

Group 1(((([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2}))(_?))+)

Group 2((([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2}))(_?))+

+repeats the group contents below at least once:

Group 3(([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2}))

1st Alternative([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})

Group 4([[:digit:]]{4})

Character Class[[:digit:]]{4}

{4}matches exactly 4 characters from the set below:

[:digit:]a digit [0-9]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 5([[:digit:]]{2})

Character Class[[:digit:]]{2}

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

[:digit:]a digit [0-9]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 6([[:digit:]]{2})

Character Class[[:digit:]]{2}

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

[:digit:]a digit [0-9]

2nd Alternative([[:digit:]]{2})-([[:digit:]]{2})

Group 7([[:digit:]]{2})

Character Class[[:digit:]]{2}

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

[:digit:]a digit [0-9]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 8([[:digit:]]{2})

Character Class[[:digit:]]{2}

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

[:digit:]a digit [0-9]

3rd Alternative([[:digit:]]{2})

Group 9([[:digit:]]{2})

Character Class[[:digit:]]{2}

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

[:digit:]a digit [0-9]

Group 10(_?)

_?optionally matches the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 11(\s(.+))?

?repeats the group contents below at most once:

\sany whitespace character

Group 12(.+)

.+any character (except for line terminators), repeated at least once

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

(((([[:digit:]]{4})-([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2})-([[:digit:]]{2})|([[:digit:]]{2}))(_?))+)(\s(.+))?

Test String
New

2023-06-25 DVD.txt
2024-07-14_15.txt
2024-06-09_09.txt
2018-05-01 VOD Orange.txt
2024-08-25_26 Disney+.txt