Regular Expressions 101

^start of line

Negative Lookahead(?!(.)\1{9}$)

Group 1(.)

.any character (except for line terminators)

\1{9}the text saved by group 1, repeated exactly 9 times

$end of line

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

\d{9}a digit, repeated exactly 9 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

^(?!(.)\1{9}$)[2-9]\d{9}$

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