関連ワード:  python find position of substring in string    python find index of substring in string    python find occurrences of substring in string    python find location of substring in string    python find count of substring in string    python find indices of substring in string    python find end of substring in string    python find list of substring in string    python find substring in string    python find substring in string case insensitive  
結果 : python find start of substring in string