Regular Expressions 101

Explanation

Pro

Group 1((?:\(?[2-9](?:(?=1)1[02-9]|(?:(?=0)0[1-9]|(?!0)\d{2}))\)?\D{0,3})(?:\(?[2-9](?:(?=1)1[02-9]|(?!1)\d{2})\)?\D{0,3})\d{4})

Non-Capturing Group(?:\(?[2-9](?:(?=1)1[02-9]|(?:(?=0)0[1-9]|(?!0)\d{2}))\)?\D{0,3})

\(?optionally matches the literal ( (40₁₀ / 50₈ / 28₁₆)

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Non-Capturing Group(?:(?=1)1[02-9]|(?:(?=0)0[1-9]|(?!0)\d{2}))

1st Alternative(?=1)1[02-9]

Positive Lookahead(?=1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[02-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2-9one character from 2 (50₁₀) to 9 (57₁₀)

2nd Alternative(?:(?=0)0[1-9]|(?!0)\d{2})

Non-Capturing Group(?:(?=0)0[1-9]|(?!0)\d{2})

1st Alternative(?=0)0[1-9]

Positive Lookahead(?=0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative(?!0)\d{2}

Negative Lookahead(?!0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\d{2}a digit, repeated exactly 2 times

\)?optionally matches the literal ) (41₁₀ / 51₈ / 29₁₆)

\D{0,3}any character that's not a digit, repeated between 0 and 3 times

Non-Capturing Group(?:\(?[2-9](?:(?=1)1[02-9]|(?!1)\d{2})\)?\D{0,3})

\(?optionally matches the literal ( (40₁₀ / 50₈ / 28₁₆)

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Non-Capturing Group(?:(?=1)1[02-9]|(?!1)\d{2})

1st Alternative(?=1)1[02-9]

Positive Lookahead(?=1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[02-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2-9one character from 2 (50₁₀) to 9 (57₁₀)

2nd Alternative(?!1)\d{2}

Negative Lookahead(?!1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d{2}a digit, repeated exactly 2 times

\)?optionally matches the literal ) (41₁₀ / 51₈ / 29₁₆)

\D{0,3}any character that's not a digit, repeated between 0 and 3 times

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

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

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

((?:\(?[2-9](?:(?=1)1[02-9]|(?:(?=0)0[1-9]|(?!0)\d{2}))\)?\D{0,3})(?:\(?[2-9](?:(?=1)1[02-9]|(?!1)\d{2})\)?\D{0,3})\d{4})

Unit Tests

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