Pattern easy

This is very is and amazing if you know

ex) if(split[i].matches("[A-Za-z]+\\.?")){

    }

what dose that mean?

i'm just looking for JAVA API

[A-Za-z] : those alphabet A from Z or a-z is available

 +       : [A-Za-z] uses more than one time

\\

.?       : .? means one or nothing  

"33. "             return false

"gefefeddd."       return true

"ddddfedAE"        return true

"d.d.d"            return false

"ddkdkjeij.33412"  return false

"12312tjkjkd@#"    return false