6.172 SCAN — Scan a string for the presence of a set of characters

Description:

Scans a STRING for any of the characters in a SET of characters.

If BACK is either absent or equals FALSE, this function returns the position of the leftmost character of STRING that is in SET. If BACK equals TRUE, the rightmost position is returned. If no character of SET is found in STRING, the result is zero.

Standard:

F95 and later

Class:

Elemental function

Syntax:

RESULT = SCAN(STRING, SET[, BACK])

Arguments:

STRING	Shall be of type CHARACTER(*).
SET	Shall be of type CHARACTER(*).
BACK	(Optional) shall be of type LOGICAL.

Return value:

The return value is of type INTEGER and of the default integer kind.

Example:

          PROGRAM test_scan
            WRITE(*,*) SCAN("FORTRAN", "AO")          ! 2, found 'O'
            WRITE(*,*) SCAN("FORTRAN", "AO", .TRUE.)  ! 6, found 'A'
            WRITE(*,*) SCAN("FORTRAN", "C++")         ! 0, found none
          END PROGRAM
     

See also:

INDEX, VERIFY