Regular Expressions 101

^start of line

Group 1(.*?)

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

Group 2((0|1)?\d)

Group 3(0|1)?

?repeats the group contents below at most once:

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4((0|1|2|3)?\d)

Group 5(0|1|2|3)?

?repeats the group contents below at most once:

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3rd Alternative2

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

4th Alternative3

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 6(19|20\d\d)

1st Alternative19

19the literal text 19

2nd Alternative20\d\d

20the literal text 20

\da digit

Group 7(.*?)

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

Search reference

Regular Expression

^(.*?)((0|1)?\d)-((0|1|2|3)?\d)-(19|20\d\d)(.*?)$

New

asasa12-12-1993.txt
asassa12-12-2010.txt