Regular Expressions 101

Pro

1st Alternative(?<=\d) (?=[\.\d])

Positive Lookbehind(?<=\d)

\da Unicode decimal digit

the literal (32₁₀ / 40₈ / 20₁₆)

Positive Lookahead(?=[\.\d])

Character Class[\.\d]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da Unicode decimal digit

2nd Alternative(?<=[A-Z]) (?=[A-Z])

Positive Lookbehind(?<=[A-Z])

Character Class[A-Z]

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

the literal (32₁₀ / 40₈ / 20₁₆)

Positive Lookahead(?=[A-Z])

Character Class[A-Z]

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

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.

25 tokens

Regular Expression

(?<=\d) (?=[\.\d])|(?<=[A-Z]) (?=[A-Z])

New

"1 . J U L Y 1 9 5 0"
"1 8 . A P R I L 1 9 8 0"
"Hello world, today is: 2 4 . J A N U A R Y 2 0 0 0"
"D E C I S I O N: 1 3 . D E C E M B E R 2 0 1 8 / P U B L I S H E D: 1 4 . D E C E M B E R 2 0 1 8"

Extraction

"1 . J U L Y 1 9 5 0"
"1 8 . A P R I L 1 9 8 0"
"Hello world, today is: 2 4 . J A N U A R Y 2 0 0 0"
"D E C I S I O N: 1 3 . D E C E M B E R 2 0 1 8 / P U B L I S H E D: 1 4 . D E C E M B E R 2 0 1 8"