<?php
// French
// Result: 1À 2Â 3Ä 4Æ
// Expect: 11 22 33 44
echo preg_replace(['/à/iu', '/â/iu', '/ä/iu', '/æ/iu'], ['1', '2', '3', '4'], 'àÀ â äÄ æÆ') . PHP_EOL;
// Result: à1 â2 ä3 æ4
// Expect: 11 22 33 44
echo preg_replace(['/À/iu', '/Â/iu', '/Ä/iu', '/Æ/iu'], ['1', '2', '3', '4'], 'àÀ â äÄ æÆ') . PHP_EOL;
// Russian
// Result: 1Ё 2Й
// Expect: 11 22
echo preg_replace(['/ё/iu', '/й/iu'], ['1', '2'], 'ёЁ йЙ') . PHP_EOL;
// Result: ё1 й2
// Expect: 11 22
echo preg_replace(['/Ё/iu', '/Й/iu'], ['1', '2'], 'ёЁ йЙ') . PHP_EOL;
preferences:
48.23 ms | 402 KiB | 5 Q