Regular Expressions 101

Explanation

Pro

^start of string

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

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

Non-Capturing Group(?:(?:,[0-9]{3})*(?:.[0-9]{2})?|(?:.[0-9]{3})*(?:,[0-9]{2})?|[0-9]*(?:[.,][0-9]{2})?)

1st Alternative(?:,[0-9]{3})*(?:.[0-9]{2})?

Non-Capturing Group(?:,[0-9]{3})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

Non-Capturing Group(?:.[0-9]{2})?

?repeats the group contents below at most once:

.any character (except for line terminators)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

2nd Alternative(?:.[0-9]{3})*(?:,[0-9]{2})?

Non-Capturing Group(?:.[0-9]{3})*

*repeats the group contents below any number of times:

.any character (except for line terminators)

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

Non-Capturing Group(?:,[0-9]{2})?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

3rd Alternative[0-9]*(?:[.,][0-9]{2})?

Character Class[0-9]*

*matches any number of characters from the set below:

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

Non-Capturing Group(?:[.,][0-9]{2})?

?repeats the group contents below at most once:

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

$end of string

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Quick Reference

26 tokens

Regular Expression

^[+-]?[0-9]{1,3}(?:(?:,[0-9]{3})*(?:.[0-9]{2})?|(?:.[0-9]{3})*(?:,[0-9]{2})?|[0-9]*(?:[.,][0-9]{2})?)$

Unit Tests

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