Regular Expressions 101

Negative Lookbehind(?<![\d.])

Character Class[\d.]

\da Unicode decimal digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

1st Alternative\d*\.\d+

\d*a Unicode decimal digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

2nd Alternative\d+\.\d*

\d+a Unicode decimal digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a Unicode decimal digit, repeated any number of times

Negative Lookahead(?![\d.])

Character Class[\d.]

\da Unicode decimal digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

(?<![\d.])(?:\d*\.\d+|\d+\.\d*)(?![\d.])

New

1.0A
1.B
.1
.
1.0.0
1.0.1
20.20.20.30
12345.657.345