Description
| Return the index where S2$ first matches S1$. If no match is found return 0.
Note: A similar function, InStrB, returns the byte index instead.
Parameter
| Description
| Index
| Start searching for S2$ at this index in S1$. If this is omitted then start searching from the beginning of S1$.
| S1$
| Search for S2$ in this string value. If this value is Null then Null is returned.
| S2$
| Search S1$ for this string value. If this value is Null then Null is returned.
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