Regular Expressions 101

Group 1([a-z]{2,})

Character Class[a-z]{2,}

{2,}matches at least 2 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Positive Lookahead(?=.*\1[a-z]*$)

.*any character, repeated any number of times

\1the text saved by group 1

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

$end of string, or before its final line terminator

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

s modifier: single line. Allows a dot to match line terminators

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

([a-z]{2,})(?=.*\1[a-z]*$)

New

adbcde
acde
|abcdefghijklmnopqrstuvwxyz