Regular Expressions 101

Pro

Non-Capturing Group(?:01(\d{14})|10([a-zA-Z0-9]{1,20})(\\x1d)?|17(\d{6})|21([a-zA-Z0-9]{1,20})(\\x1d)?)

1st Alternative01(\d{14})

01the literal text 01

Group 1(\d{14})

\d{14}a digit, repeated exactly 14 times

2nd Alternative10([a-zA-Z0-9]{1,20})(\\x1d)?

10the literal text 10

Group 2([a-zA-Z0-9]{1,20})

Character Class[a-zA-Z0-9]{1,20}

{1,20}matches between 1 and 20 characters from the set below:

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

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

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

Group 3(\\x1d)?

?repeats the group contents below at most once:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

x1dthe literal text x1d (case sensitive)

3rd Alternative17(\d{6})

17the literal text 17

Group 4(\d{6})

\d{6}a digit, repeated exactly 6 times

4th Alternative21([a-zA-Z0-9]{1,20})(\\x1d)?

21the literal text 21

Group 5([a-zA-Z0-9]{1,20})

Character Class[a-zA-Z0-9]{1,20}

{1,20}matches between 1 and 20 characters from the set below:

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

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

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

Group 6(\\x1d)?

?repeats the group contents below at most once:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

x1dthe literal text x1d (case sensitive)

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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25 tokens

(?:01(\d{14})|10([a-zA-Z0-9]{1,20})(\\x1d)?|17(\d{6})|21([a-zA-Z0-9]{1,20})(\\x1d)?)

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