Lahey/GNU Fortran

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8.124 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:

STRING Shall be a scalar CHARACTER, with INTENT(IN)
SUBSTRING Shall 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:

Name Argument Return type Standard
INDEX(STRING, SUBSTRING) CHARACTER INTEGER(4) Fortran 77 and later

See also:
SCAN, VERIFY