Regular Expressions 101

Negative Lookbehind(?<!\d\.)

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ban ASCII word boundary

\d{9}a digit, repeated exactly 9 times

\ban ASCII word boundary

Negative Lookahead(?!\.\d)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

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\.)\b\d{9}\b(?!\.\d)

New

123456789
123456789.123
1.123456789
sdf 123456789 lorem ipsum
112233445566778899