Regular Expressions 101

Pro

^start of line

Group 1(-[0-9]+|0|1[1-9]|[2-9][0-9]|[0-9]{3,})

1st Alternative-[0-9]+

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

3rd Alternative1[1-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[1-9]

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

4th Alternative[2-9][0-9]

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Character Class[0-9]

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

5th Alternative[0-9]{3,}

Character Class[0-9]{3,}

{3,}matches at least 3 characters from the set below:

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

$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

^(-[0-9]+|0|1[1-9]|[2-9][0-9]|[0-9]{3,})$

New

11
0
-1
100
1000
1111

What shouldn't match: 
10
1
abc11
11abc
a11b

11
0
-1
100
1000
1111

What shouldn't match: 
10
1
abc11
11abc
a11b