Regular Expressions 101

Explanation

Pro

1st Alternative(?<!-)(0,\d*[0-9])

Negative Lookbehind(?<!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 1(0,\d*[0-9])

0,the literal text 0,

\d*a digit, repeated any number of times

Character Class[0-9]

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

2nd Alternative(?<!0)([1-9]\d*,\d*)

Negative Lookbehind(?<!0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Group 2([1-9]\d*,\d*)

Character Class[1-9]

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

\d*a digit, repeated any number of times

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d*a digit, repeated any number of times

3rd Alternative(-[0-9],\d*?[1-9]\d*)

Group 3(-[0-9],\d*?[1-9]\d*)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d*?a digit, repeated any number of times

Character Class[1-9]

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

\d*a digit, repeated any number of times

4th Alternative(-[1-9]\d*,{0,1}\d*)

Group 4(-[1-9]\d*,{0,1}\d*)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[1-9]

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

\d*a digit, repeated any number of times

,{0,1}optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

\d*a digit, repeated any number of times

5th Alternative\b(?<!-)(0)[a-zA-Z,\n]

\ban ASCII word boundary

Negative Lookbehind(?<!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 5(0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[a-zA-Z,\n]

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

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\na line-feed (newline) character (ASCII 10)

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

(?<!-)(0,\d*[0-9])|(?<!0)([1-9]\d*,\d*)|(-[0-9],\d*?[1-9]\d*)|(-[1-9]\d*,{0,1}\d*)|\b(?<!-)(0)[a-zA-Z,\n]

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