String search in Fortran

Mon, Feb 29, 2016

tags: fortran Think of a problem finding the substring def in the string abcdefg.

I though Fortran does not have an efficient way of doing this and I have to make own subroutine to achieve this. But Fortran has such a function, index.

See, INDEX -- position of a substring within a string

Its syntax is, :

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

and the return value is an integer of the substring position.

The return value starts from 1 if the substring exists. If there is nothing matched with the substring, the return value becomes 0.