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9.147 INDEX — Position of a substring within a string

Description:

Returns the position of the start of the first occurrence of string SUBSTRING as a substring in STRING, counting from one. If SUBSTRING is not present in STRING, zero is returned. If the BACK argument is present and true, the return value is the start of the last occurrence rather than the first.

Standard:

Fortran 77 and later, with KIND argument Fortran 2003 and later

Class:

Elemental function

Syntax:

RESULT = INDEX(STRING, SUBSTRING [, BACK [, KIND]])

Arguments:
STRINGShall be a scalar CHARACTER, with INTENT(IN)
SUBSTRINGShall be a scalar CHARACTER, with INTENT(IN)
BACK(Optional) Shall be a scalar LOGICAL, with INTENT(IN)
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.

Specific names:
NameArgumentReturn typeStandard
INDEX(STRING, SUBSTRING)CHARACTERINTEGER(4)Fortran 77 and later
See also:

SCAN, VERIFY