Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:[0-9]|[0-8][0-9]|90)

1st Alternative[0-9]

Character Class[0-9]

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

2nd Alternative[0-8][0-9]

Character Class[0-8]

0-8one character from 0 (48₁₀) to 8 (56₁₀)

Character Class[0-9]

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

3rd Alternative90

90the literal text 90

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

^(?:[0-9]|[0-8][0-9]|90)(?:\.\d+)?$