note 38442 added to function.substr-count

Yet another reference to the "cgcgcgcgcgcgc" example posted by "chris at pecoraro dot net": Your request can be fulfilled with the Perl compatible regular expressions and their lookahead and lookbehind features. The example $number_of_full_pattern = preg_match_all('/(cgc)/', "cgcgcgcgcgcgcg", $chunks); works like the substr_count function. The variable $number_of_full_pattern has the value 3, because the default behavior of Perl compatible regular expressions is to consume the characters of the string subject that were matched by the (sub)pattern. That is, the pointer will be moved to the end of the matched substring. But we can use the lookahead feature that disables the moving of the pointer: $number_of_full_pattern = preg_match_all('/(cg(?=c))/', "cgcgcgcgcgcgcg", $chunks); In this case the variable $number_of_full_pattern has the value 6. Firstly a string "cg" will be matched and the pointer will be moved to the end of this string. Then the regular expression looks ahead whether a 'c' can be matched. Despite of the occurence of the character 'c' the pointer is not moved. ---- Manual Page -- http://www.php.net/manual/en/function.substr-count.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+38442 Delete -- http://master.php.net/manage/user-notes.php?action=delete+38442&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+38442&report=yes Search -- http://master.php.net/manage/user-notes.php