regex101: date pattern

Pro

Positive Lookahead(?=\b(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|\d{4}|\d{1,2}))

\ba Unicode word boundary

Group 1(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|\d{4}|\d{1,2})

1st Alternativejan

janthe literal text jan (case insensitive)

2nd Alternativefeb

febthe literal text feb (case insensitive)

3rd Alternativemar

marthe literal text mar (case insensitive)

4th Alternativeapr

aprthe literal text apr (case insensitive)

5th Alternativemay

maythe literal text may (case insensitive)

6th Alternativejun

junthe literal text jun (case insensitive)

7th Alternativejul

julthe literal text jul (case insensitive)

8th Alternativeaug

augthe literal text aug (case insensitive)

9th Alternativesep

septhe literal text sep (case insensitive)

10th Alternativeoct

octthe literal text oct (case insensitive)

11th Alternativenov

novthe literal text nov (case insensitive)

12th Alternativedec

decthe literal text dec (case insensitive)

13th Alternative\d{4}

\d{4}a Unicode decimal digit, repeated exactly 4 times

14th Alternative\d{1,2}

\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times

\w*a Unicode word character, repeated any number of times

Character Class[\t\ \\\/\.\,\;\:\-\+\_]+

+matches at least one character from the set below:

\ta tab character (ASCII 9)

\ the literal (32₁₀ / 40₈ / 20₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

\;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\:the literal : (58₁₀ / 72₈ / 3A₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 2(\d{1,2}|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)

1st Alternative\d{1,2}

\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times

2nd Alternativejan

janthe literal text jan (case insensitive)

3rd Alternativefeb

febthe literal text feb (case insensitive)

4th Alternativemar

marthe literal text mar (case insensitive)

5th Alternativeapr

aprthe literal text apr (case insensitive)

6th Alternativemay

maythe literal text may (case insensitive)

7th Alternativejun

junthe literal text jun (case insensitive)

8th Alternativejul

9th Alternativeaug

10th Alternativesep

11th Alternativeoct

12th Alternativenov

13th Alternativedec

\w*a Unicode word character, repeated any number of times

Character Class[\t\ \\\/\.\,\;\:\-\+\_]+

Group 3(\d{4}|\d{1,2})

\w*a Unicode word character, repeated any number of times

\ba Unicode word boundary

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

25 tokens

Regular Expression

(?=\b(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|\d{4}|\d{1,2}))\w*[\t\ \\\/\.\,\;\:\-\+\_]+(\d{1,2}|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\w*[\t\ \\\/\.\,\;\:\-\+\_]+(\d{4}|\d{1,2})\w*\b

Unit Tests

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