Php Regular Expression Matching. output with the same 3 characters: yes

Evaluate the php regular expression to match the output with three identical characters. for example, $ str = "I am"; there are three identical words echo & nbsp; 'yes '; $ str2 = "I am a great guy"; there are three identical words echo & nbsp; 'yes'; $ str3 = "12333456 "; there are 3 identical words echo & nbsp; 'Ye: php regular expression matching 3 identical output yes
For example
$ Str = "me and I ";

There are 3 identical words
Echo 'yes ';


$ Str2 = "I am a great guy ";

There are 3 identical words
Echo 'yes ';




$ Str3 = "12333456 ";

There are 3 identical words
Echo 'yes ';


I don't know what the character is! It must contain three identical characters.
Method! Best Regular Expressions
------ Solution --------------------

$ Str2 = "I am a great guy ";
If (preg_match ('/(. +) \ 1 {2}/', $ str2 ))
Echo 'yes ';