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9.237 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:

Fortran 90 and later, with KIND argument Fortran 2003 and later

Class:

Elemental function

Syntax:

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

Arguments:

STRING	Shall be of type CHARACTER.
SET	Shall be of type CHARACTER.
BACK	(Optional) shall be of type LOGICAL.
KIND	(Optional) An INTEGER initialization expression indicating the kind parameter of the result.

Return value:

The return value is of type INTEGER and of kind KIND. If KIND is absent, the return value is of 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 — Position of a substring within a string, VERIFY — Scan a string for characters not a given set