Regular Expressions 101

^start of line

Non-Capturing Group(?:2[0-5]|[1][0-9]|[1-9])

1st Alternative2[0-5]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative[1][0-9]

Character Class[1]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd 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

^(?:2[0-5]|[1][0-9]|[1-9])$

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