// ======================================================== // COUNT OCCURRENCES ( // STR, // String to search through // SUB // String to search for // ) // -------------------------------------------------------- // Counts the instances of SUB in STR. Counts overlapping // occurrences. Count_Occurrences( 'rrrrr', 'rr') = 4. // -------------------------------------------------------- function Count_Occurrences ( STR, SUB ) { var last = 0; var count = 0; while ((last = STR.indexOf(SUB, last + 1)) > -1) { count++ } return count; }