Regular Expressions 101

^start of line

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated any number of times

Non-Capturing Group(?:[2-9]|[1-9]\d\d*)

1st Alternative[2-9]

Character Class[2-9]

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

2nd Alternative[1-9]\d\d*

Character Class[1-9]

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

\da digit

\d*a digit, repeated any number of 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

^0*(?:[2-9]|[1-9]\d\d*)$

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