regex101: PCRE (Legacy) Match Workspace

Pro

Positive Lookbehind(?<=^|[a-zA-Z ])

1st Alternative^

^start of line

2nd Alternative[a-zA-Z ]

Character Class[a-zA-Z ]

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

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

the literal (32₁₀ / 40₈ / 20₁₆)

Group 1(0[0-9]|1[12]|[1-9])

1st Alternative0[0-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[0-9]

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

2nd Alternative1[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

3rd Alternative[1-9]

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Non-Capturing Group(?:\/|\\)

1st Alternative\/

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative\\

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group 2([\d]{4})

Character Class[\d]{4}

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

\da digit

Positive Lookahead(?=[a-zA-Z ]|$)

1st Alternative[a-zA-Z ]

Character Class[a-zA-Z ]

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

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

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative$

$end of line

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

25 tokens

Regular Expression

(?<=^|[a-zA-Z ])(0[0-9]|1[12]|[1-9])(?:\/|\\)([\d]{4})(?=[a-zA-Z ]|$)

New

The range of dates go from 21/02/2020 to 21/03/2020 as specified above
The range of dates go from 21/2/2020 to 21/3/2020 as specified above
The range of dates go from 21/2/2020 to 21/23/2020 as specified above
The range of dates go from 2/2020 to 23/2020 as specified above
The range of dates go from 12/2020 to 23/2020 as specified above
The range of dates go from 05/2020 to 23/2020 as specified above
05/2020 test
test 05/2020

Extraction

The range of dates go from 21/02/2020 to 21/03/2020 as specified above
The range of dates go from 21/2/2020 to 21/3/2020 as specified above
The range of dates go from 21/2/2020 to 21/23/2020 as specified above
The range of dates go from 2/2020 to 23/2020 as specified above
The range of dates go from 12/2020 to 23/2020 as specified above
The range of dates go from 05/2020 to 23/2020 as specified above
05/2020 test
test 05/2020