Regular Expressions 101

Pro

Group 1(\d{1,2}[\/\.]\d{1,2}[\/\.][\d\s]*)

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

Character Class[\/\.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Character Class[\/\.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\d\s]*

*matches any number of characters from the set below:

\da digit

\sany whitespace character

\s?optionally matches any whitespace character

Non-Capturing Group(?:[-–\s]|đến)

1st Alternative[-–\s]

Character Class[-–\s]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

–the literal – (8211₁₀ / 20023₈ / 2013₁₆)

\sany whitespace character

2nd Alternativeđến

đếnthe literal text đến (case sensitive)

\s?optionally matches any whitespace character

Group 2((\d{1,2}[\/\.]\d{1,2}[\/\.]\d{2,4})|(…)|(\.\.\.))

1st Alternative(\d{1,2}[\/\.]\d{1,2}[\/\.]\d{2,4})

Group 3(\d{1,2}[\/\.]\d{1,2}[\/\.]\d{2,4})

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

Character Class[\/\.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Character Class[\/\.]

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{2,4}a digit, repeated between 2 and 4 times

2nd Alternative(…)

Group 4(…)

…the literal … (8230₁₀ / 20046₈ / 2026₁₆)

3rd Alternative(\.\.\.)

Group 5(\.\.\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Global pattern flags

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

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25 tokens

Regular Expression

(\d{1,2}[\/\.]\d{1,2}[\/\.][\d\s]*)\s?(?:[-–\s]|đến)\s?((\d{1,2}[\/\.]\d{1,2}[\/\.]\d{2,4})|(…)|(\.\.\.))

Unit Tests

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