Regular Expressions 101

^start of line

Group 1(-?(?:[1-9][2-9]\d|[2-9]\d\d|[1-9]\d{3,}))

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:[1-9][2-9]\d|[2-9]\d\d|[1-9]\d{3,})

1st Alternative[1-9][2-9]\d

Character Class[1-9]

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

Character Class[2-9]

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

\da digit

2nd Alternative[2-9]\d\d

Character Class[2-9]

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

\da digit

3rd Alternative[1-9]\d{3,}

Character Class[1-9]

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

\d{3,}a digit, repeated at least 3 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

^(-?(?:[1-9][2-9]\d|[2-9]\d\d|[1-9]\d{3,}))$

New

-1000
-200
-150
-1
0
1
12u
119
120
121
200
315
450
1000
1300
2300
6544
32165465465321312