Regular Expressions 101

Pro

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?!(?<=\d\.)\d)

Positive Lookbehind(?<=\d\.)

\da Unicode decimal digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da Unicode decimal digit

Negative Lookahead(?! )

the literal (32₁₀ / 40₈ / 20₁₆)

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

\.(?!(?<=\d\.)\d)(?! )

New

this is a.match
this should also match.1234
and this should 123.match

this should NOT match. Has space after period
this also should NOT match 1.23

.

this is a.match
this should also match.1234
and this should 123.match

this should NOT match. Has space after period
this also should NOT match 1.23