Regular Expressions 101

^start of line

Group 1(\d{0,2}(?:\/\d{0,2}(?:\/\d{0,4})?)?)

\d{0,2}a digit, repeated between 0 and 2 times

Non-Capturing Group(?:\/\d{0,2}(?:\/\d{0,4})?)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{0,2}a digit, repeated between 0 and 2 times

Non-Capturing Group(?:\/\d{0,4})?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{0,4}a digit, repeated between 0 and 4 times

Non-Capturing Group(?:\s\d{0,2}(?::\d{0,2}(?:\s([APap]?[Mm]?)?)?)?)?

?repeats the group contents below at most once:

\sany whitespace character

\d{0,2}a digit, repeated between 0 and 2 times

Non-Capturing Group(?::\d{0,2}(?:\s([APap]?[Mm]?)?)?)?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{0,2}a digit, repeated between 0 and 2 times

Non-Capturing Group(?:\s([APap]?[Mm]?)?)?

?repeats the group contents below at most once:

\sany whitespace character

Group 2([APap]?[Mm]?)?

?repeats the group contents below at most once:

Character Class[APap]?

?matches at most one character from the set below:

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

Pthe literal P (80₁₀ / 120₈ / 50₁₆) (case sensitive)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case sensitive)

Character Class[Mm]?

?matches at most one character from the set below:

Mthe literal M (77₁₀ / 115₈ / 4D₁₆) (case sensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

$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{0,2}(?:\/\d{0,2}(?:\/\d{0,4})?)?)(?:\s\d{0,2}(?::\d{0,2}(?:\s([APap]?[Mm]?)?)?)?)?$

New

03/01/1982
03/01/1982 3:14 pm
77/77/7777
77/77/7777 77:77

03/01/1982
03/01/1982 3:14 pm
77/77/7777
77/77/7777 77:77