Is there a way to extract only strings from a specific location?

Modified to meet the requirements. First, separate it with \n Navigate through an array of separated strings and find the desired word. " The + " character is different from the one without If there is, look for spaces from the index before "+" and if there isn' Find spaces from the last -1 index. (This is because the sample may also have a space before \n.)

message="2433234124\n25543341456\n456549 123 \n456549 12 + 3 \n456549 1 + 2 + 3 \n"
strArray = message.split("\n")

for str in strArray:
        plusPos = str.find(" + ")
        if plusPos == -1:
            startPos = str[:-1].rfind(" ")
        else:
            startPos = str[:plusPos - len(str)].rfind(" ")
        print str[startPos + 1:]