Regular Expressions 101

Group 1([a-zA-Z]*)

Character Class[a-zA-Z]*

*matches any number of 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)

Atomic Group(?> |-)

1st Alternative

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2([0-9]{1,2})

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

Atomic Group(?>, |-)

1st Alternative,

, the literal text ,

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3([0-9]{2,4})

Character Class[0-9]{2,4}

{2,4}matches between 2 and 4 characters from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

Group 4([0-9]{1,2}:[0-9]{1,2})

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

Group 5(AM|PM)?

?repeats the group contents below at most once:

1st AlternativeAM

AMthe literal text AM (case sensitive)

2nd AlternativePM

PMthe literal text PM (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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

([a-zA-Z]*)(?> |-)([0-9]{1,2})(?>, |-)([0-9]{2,4}) ([0-9]{1,2}:[0-9]{1,2}) (AM|PM)?

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January 2, 2020 4:15 PM
January-14-20 12:44 PM
December-24-19 20:15 PM. 
December-24-19 20:15