Search is spliting Indian Languages words inappropriatly.

Hi,
Search module's search_simplify function is splitting Indic-language's text inappropriately. Therefore indexing and searching of Indic content is buggy. This is happening around line 300 of search.module file. Below line is responsible for this.
$text = preg_replace('/['. PREG_CLASS_SEARCH_EXCLUDE . ']+/u', ' ', $text);

Reason: As for as we understood, defined PREG_CLASS_SEARCH_EXCLUDE holds many Mn and Mc Unicode chars which are actively used in Indic words. Though many of Mn and Mc characters are already excluded from the list. example 0300;COMBINING GRAVE ACCENT;Mn;230;NSM;;;;;N;NON-SPACING GRAVE;Varia;;;

Example for Mn and Mc Chars remaining -- \x{903}\x{93c}\x{93e}-\x{94d}\x{951}-\x{954}

Solution: To exclude all Mn and Mc chars from PREG_CLASS_SEARCH_EXCLUDE variable.