Regular Expressions 101

Pro

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 2([0-9]|0[0-9]|1[0-9]|2[0-3])

1st Alternative[0-9]

Character Class[0-9]

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

2nd Alternative0[0-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[0-9]

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

3rd Alternative1[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

4th 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)

Group 3([0-5][0-9])

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)

:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 4([0-5][0-9])?

?repeats the group contents below at most once:

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)

Group 5( AM| PM)?

?repeats the group contents below at most once:

1st Alternative AM

AMthe literal text AM (case sensitive)

2nd Alternative PM

PMthe literal text PM (case sensitive)

Group 6( [+-]\d{4})?

?repeats the group contents below at most once:

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[+-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(.*?) ([0-9]|0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):?([0-5][0-9])?( AM| PM)?( [+-]\d{4})?

New

June 27, 1993 5:10 PM
2013-07-26 09:50:17 -0400