Regular Expressions 101

Explanation

Pro

^start of line

Negative Lookahead(?!.*?([0-8])\1\1)

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

Group 1([0-8])

Character Class[0-8]

0-8one character from 0 (48₁₀) to 8 (56₁₀)

\1the text saved by group 1

\d{10,25}a digit, repeated between 10 and 25 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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

27 tokens

Regular Expression

^(?!.*?([0-8])\1\1)\d{10,25}$

New

Need help to stop user from entering phone number with three or more repeated digits except 999. Phone number could be 10 digit to 25 digit.

Bad Input
8777267331
000
6666787876

Exception.
767886655999

Substitution

Need help to stop user from entering phone number with three or more repeated digits except 999. Phone number could be 10 digit to 25 digit.

Bad Input
8777267331
000
6666787876

Exception.
767886655999