D Documentation  
find
int find(char[] s, dchar c)
int find(char[] s, char[] sub)

Find first occurrance of sub or c in string s. Return index where it was found, otherwise returns -1.

There are also case-sensitive versions available:

int ifind(char[] s, dchar c)
int ifind(char[] s, char[] sub)

See also:
splitlines, rfind
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