Regular Expressions 101

Explanation

Pro

Group year(?<year>\d{4})

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group month(?<month>0[1-9]|1[0-2])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group day(?<day>0[1-9]|1[0-9]|2[0-9]|3[0-1])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative1[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd Alternative2[0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

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

4th Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

Group time(?<time>(?:[0-1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](?:.\d{3})?)

Non-Capturing Group(?:[0-1][0-9]|2[0-3])

1st Alternative[0-1][0-9]

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Character Class[0-9]

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

2nd Alternative2[0-3]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

Character Class[0-9]

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

Character Class[0-9]

Non-Capturing Group(?:.\d{3})?

Group timezone(?<timezone>Z|[\+\-](?:0[1-9]|1[0-2]):(?:00|15|30|45))

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

Ready to run

Quick Reference

26 tokens

Regular Expression

(?<year>\d{4})-(?<month>0[1-9]|1[0-2])-(?<day>0[1-9]|1[0-9]|2[0-9]|3[0-1])T(?<time>(?:[0-1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](?:.\d{3})?)(?<timezone>Z|[\+\-](?:0[1-9]|1[0-2]):(?:00|15|30|45))

Unit Tests