Regular Expressions 101

^start of line

Group int(?'int'[1-2]?[1-9]|3[01])

1st Alternative[1-2]?[1-9]

Character Class[1-2]?

?matches at most one character from the set below:

1-2one character from 1 (49₁₀) to 2 (50₁₀)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 2((,\g'int')|(-\g'int'(?=$|,)))*

*repeats the group contents below any number of times:

1st Alternative(,\g'int')

Group 3(,\g'int')

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\g'int'calls group int as a subroutine

2nd Alternative(-\g'int'(?=$|,))

Group 4(-\g'int'(?=$|,))

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\g'int'calls group int as a subroutine

Positive Lookahead(?=$|,)

1st Alternative$

$end of line

2nd Alternative,

,the literal , (44₁₀ / 54₈ / 2C₁₆)

$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.

25 tokens

Regular Expression

^(?'int'[1-2]?[1-9]|3[01])((,\g'int')|(-\g'int'(?=$|,)))*$

New

2-2,1
1-5,5,15-29
1-1-1-1
2,5,7-20
2,3-6,3
1-24,5-6,2-9
15,25,3
412,28,1-31,15
1-5,5,15-32
1-5,5,45-31

2-2,1
1-5,5,15-29
1-1-1-1
2,5,7-20
2,3-6,3
1-24,5-6,2-9
15,25,3
412,28,1-31,15
1-5,5,15-32
1-5,5,45-31