<?php
$str = "this is a Test String to get the last index of word with an uppercase letter in PHP";
$pattern = "/.*\s([A-Z])(\w+)/";
//$pattern = "/.*\s([A-Z])[A-Z]+/";
preg_match($pattern, $str, $match);
var_dump($match);
$letter = $match[1];
$word = $match[1] . $match[2];
$position = strrpos($str, $match[1].$match[2]);
echo $letter . $word. $position;
array(3) {
[0]=>
string(83) "this is a Test String to get the last index of word with an uppercase letter in PHP"
[1]=>
string(1) "P"
[2]=>
string(2) "HP"
}
PPHP80