Regular Expressions 101

Explanation

Pro

^start of line

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

1st Alternative[2-9]\d{2,}

Character Class[2-9]

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

\d{2,}a digit, repeated at least 2 times

2nd Alternative1\d{3,}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

$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.

25 tokens

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

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