Regular Expressions 101

^start of line

Group 1(\d{4}-\d{2}-\d{2})

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

Group 2(T\d{2}:\d{2}:\d{2}(\.\d{3})?(Z|[+-]\d{2}:\d{2})?)?

?repeats the group contents below at most once:

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

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

Group 3(\.\d{3})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{3}a digit, repeated exactly 3 times

Group 4(Z|[+-]\d{2}:\d{2})?

?repeats the group contents below at most once:

1st AlternativeZ

Zthe literal Z (90₁₀ / 132₈ / 5A₁₆) (case sensitive)

2nd Alternative[+-]\d{2}:\d{2}

Character Class[+-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

$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

Detailed match information will be displayed here automatically.

26 tokens

Regular Expression

^(\d{4}-\d{2}-\d{2})(T\d{2}:\d{2}:\d{2}(\.\d{3})?(Z|[+-]\d{2}:\d{2})?)?$

New

1995-12-05
2023-01-10T19:00:12
2023-01-10T20:59:59+00:00