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<?php $string = "This is my test string {ABC}. This is test {XYZ}. I am new for PHP {PHP}". $i = 1; echo preg_replace_callback('/\{(.+?)\}/', function (array $match) use (&$i) { return sprintf('{%s %d}', $match[1], $i++); }, $string);
Output for git.master, git.master_jit, rfc.property-hooks
This is my test string {ABC 1}. This is test {XYZ 2}. I am new for PHP {PHP 3}1

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