Regular Expressions 101

Negative Lookbehind(?<!\d)

\da Unicode decimal digit

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

\d{10}a Unicode decimal digit, repeated exactly 10 times

Negative Lookahead(?!\d)

\da Unicode decimal 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.

25 tokens

Regular Expression

(?<!\d)8\d{10}(?!\d)

New

johns id is 81245678316 
eric bought 82241624316 yesterday              
mine is87721624316                             
frank is a genius                              
i accepted new 82891224316again