regex101: numbers between 200 and 3000

Pro

1st Alternative(^[2-9][0-9]{2}$)

Group 1(^[2-9][0-9]{2}$)

^start of line

Character Class[2-9]

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

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

$end of line

2nd Alternative(^[1-2][0-9]{3}$)

Group 2(^[1-2][0-9]{3}$)

^start of line

Character Class[1-2]

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

Character Class[0-9]{3}

{3}matches exactly 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

25 tokens

Regular Expression

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

Substitution