Regular Expressions 101

^start of line

Non-Capturing Group(?:[0-9](?:[.](?:[0-9](?:[0-9]9?)?)?)?)?

?repeats the group contents below at most once:

Character Class[0-9]

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

Non-Capturing Group(?:[.](?:[0-9](?:[0-9]9?)?)?)?

?repeats the group contents below at most once:

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

?repeats the group contents below at most once:

Character Class[0-9]

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

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

?repeats the group contents below at most once:

Character Class[0-9]

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

9?optionally matches the literal 9 (57₁₀ / 71₈ / 39₁₆)

$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

^(?:[0-9](?:[.](?:[0-9](?:[0-9]9?)?)?)?)?$

0.009
0.001