Regular Expressions 101

^start of line

Negative Lookahead(?!\d{5,})

\d{5,}a digit, repeated at least 5 times

.*?any character (except for line terminators), repeated any number of times

$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

^(?!\d{5,}).*?$

New

12345testing123asd
1234testing1234
testing12345
testing