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<?php $str = "test.string.1.sometext.more"; $startingOffset = 5; $pattern = '~^.{' . $startingOffset . '}[^.]*\K\.~'; $replacement = 2; echo preg_replace($pattern, $replacement, $str); echo "\n---\n"; $offset = strpos($str, '.', $startingOffset); if ($offset !== false) { $str[$offset] = $replacement; } echo $str;
Output for git.master, rfc.property-hooks, git.master_jit
test.string21.sometext.more --- test.string21.sometext.more

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