Regular Expressions 101

Group 1(\b\w{4,}\b)

\ban ASCII word boundary

\w{4,}any word character, repeated at least 4 times

\ban ASCII word boundary

Non-Capturing Group(?:.*?\1){4,}

{4,}repeats the group contents below at least 4 times:

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

\1the text saved by group 1

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

(\b\w{4,}\b)(?:.*?\1){4,}

New

je veux juste tester si le mot marche bien ou non 
Je teste Bonjour helloo Bonjour toto Bonjour Bonjour tata Bonjour titi Bonjour ok Bonjour test
le mot et Bonjour 
Monument test Monument test Monument bla Monument hihi Monument haha Monument Monument
Bonjour hello Bonjour Bonjour