Regular Expressions 101

Pro

^start of line

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:00?|[1-9][0-9]?)

1st Alternative00?

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

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

Character Class[1-9]

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

Character Class[0-9]?

?matches at most one character 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

Detailed match information will be displayed here automatically.

25 tokens

^[0-9]{1,2}\.(?:00?|[1-9][0-9]?)$