Regular Expressions 101

Explanation

Pro

^start of line

Atomic Group(?>(?!\2\b|\3\b)(1\d{1}|2[0-2]{1}|\d{1}+)[,.; ]+)

Negative Lookahead(?!\2\b|\3\b)

1st Alternative\2\b

\2the text saved by group 2

\ban ASCII word boundary

2nd Alternative\3\b

\3the text saved by group 3

\ban ASCII word boundary

Group 1(1\d{1}|2[0-2]{1}|\d{1}+)

1st Alternative1\d{1}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d{1}a digit, repeated exactly 1 time

2nd Alternative2[0-2]{1}

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-2]{1}

{1}matches one character from the set below:

0-2one character from 0 (48₁₀) to 2 (50₁₀)

3rd Alternative\d{1}+

\d{1}+a digit, repeated exactly 1 time

Character Class[,.; ]+

+matches at least one character from the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Atomic Group(?>(?!\1\b|\3\b)(1\d{1}|2[0-2]{1}|\d{1}+)[,.; ]+)

Negative Lookahead(?!\1\b|\3\b)

1st Alternative\1\b

\1the text saved by group 1

\ban ASCII word boundary

2nd Alternative\3\b

\3the text saved by group 3

\ban ASCII word boundary

Group 2(1\d{1}|2[0-2]{1}|\d{1}+)

1st Alternative1\d{1}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d{1}a digit, repeated exactly 1 time

2nd Alternative2[0-2]{1}

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-2]{1}

{1}matches one character from the set below:

0-2one character from 0 (48₁₀) to 2 (50₁₀)

3rd Alternative\d{1}+

\d{1}+a digit, repeated exactly 1 time

Character Class[,.; ]+

+matches at least one character from the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Atomic Group(?>(?!\1\b|\2\b)(1\d{1}|2[0-2]{1}|\d{1}+))

Negative Lookahead(?!\1\b|\2\b)

1st Alternative\1\b

\1the text saved by group 1

\ban ASCII word boundary

2nd Alternative\2\b

\2the text saved by group 2

\ban ASCII word boundary

Group 3(1\d{1}|2[0-2]{1}|\d{1}+)

1st Alternative1\d{1}

2nd Alternative2[0-2]{1}

3rd Alternative\d{1}+

$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

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Quick Reference

25 tokens

Regular Expression

^(?>(?!\2\b|\3\b)(1\d{1}|2[0-2]{1}|\d{1}+)[,.; ]+)(?>(?!\1\b|\3\b)(1\d{1}|2[0-2]{1}|\d{1}+)[,.; ]+)(?>(?!\1\b|\2\b)(1\d{1}|2[0-2]{1}|\d{1}+))$

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