Regular Expressions 101

^start of line

Non-Capturing Group(?:(?:(?:1000|[1-9][0-9][0-9]|[1-9][0-9]|[1-9]) ){0})

Non-Capturing Group(?:(?:1000|[1-9][0-9][0-9]|[1-9][0-9]|[1-9]) ){0}

{0}repeats the group contents below exactly 0 times:

Non-Capturing Group(?:1000|[1-9][0-9][0-9]|[1-9][0-9]|[1-9])

1st Alternative1000

1000the literal text 1000

2nd Alternative[1-9][0-9][0-9]

Character Class[1-9]

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

Character Class[0-9]

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

Character Class[0-9]

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

3rd Alternative[1-9][0-9]

Character Class[1-9]

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

Character Class[0-9]

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

4th Alternative[1-9]

Character Class[1-9]

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

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:1000|[1-9][0-9][0-9]|[1-9][0-9]|[1-9])

1st Alternative1000

1000the literal text 1000

2nd Alternative[1-9][0-9][0-9]

Character Class[1-9]

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

Character Class[0-9]

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

Character Class[0-9]

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

3rd Alternative[1-9][0-9]

Character Class[1-9]

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

Character Class[0-9]

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

4th Alternative[1-9]

Character Class[1-9]

1-9one character from 1 (49₁₀) 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.

Search reference

Regular Expression

^(?:(?:(?:1000|[1-9][0-9][0-9]|[1-9][0-9]|[1-9]) ){0})(?:1000|[1-9][0-9][0-9]|[1-9][0-9]|[1-9])$

New

2
3 100
95 13 25
3 100
1000 1000 1000
1 2 3 4

Regular Expression

Extraction