如何判断一个字符串是不是英文字母和数字

data str type string.

data hty like DD01V-DATATYPE.

str = '45545423154'.

call function 'NUMERIC_CHECK'

  exporting

    STRING_IN        = str

 IMPORTING

*   STRING_OUT       =

   HTYPE            = hty

          .

IF str > '0000000000' AND str <= '9999999999'

       AND hty = 'NUMC'.

 

     write: / 'NUMC',str.

else.

    write: / 'char',str.

endif.