note 110213 added to function.preg-replace

I'm reading a string from a file: '\tfirst\n\tsecond\n'. The string has 19 characters, \n are two characters, \t are two characters. I want to transform the two chars "\n" in one char "\n", the two "\t" in one "\t", and any char followed by \ in one char "\ANY_CHAR", using the preg_replace as following: preg_replace("/\\\\([\w])/", "\\\\\\1", $string); But it's not working. Somebody can help me? ---- Server IP: 69.147.83.199 Probable Submitter: 200.137.65.105 ---- Manual Page -- http://www.php.net/manual/en/function.preg-replace.php Edit -- https://master.php.net/note/edit/110213 Del: integrated -- https://master.php.net/note/delete/110213/integrated Del: useless -- https://master.php.net/note/delete/110213/useless Del: bad code -- https://master.php.net/note/delete/110213/bad+code Del: spam -- https://master.php.net/note/delete/110213/spam Del: non-english -- https://master.php.net/note/delete/110213/non-english Del: in docs -- https://master.php.net/note/delete/110213/in+docs Del: other reasons-- https://master.php.net/note/delete/110213 Reject -- https://master.php.net/note/reject/110213 Search -- https://master.php.net/manage/user-notes.php