Regular Expressions 101

^start of line

Group 1([1-9]?\d(\.\d{1,2})?|100(\.0{1,2})?)

1st Alternative[1-9]?\d(\.\d{1,2})?

Character Class[1-9]?

?matches at most one character from the set below:

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

\da digit

Group 2(\.\d{1,2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

2nd Alternative100(\.0{1,2})?

100the literal text 100

Group 3(\.0{1,2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0{1,2}the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated between 1 and 2 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

^([1-9]?\d(\.\d{1,2})?|100(\.0{1,2})?)$

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