Roku Developer Program

[greubel]

What should this return ?
fld = "1234"
i = fld.instr( 1, "1234" )
? "i = " i
return

You would think that it would be a 1 but if a field matches the search value it comes back with -1 ????

[RokuKevin]

The string is zero indexed.... So to get a match you need to start at 0 not 1

i=fld.instr(0,"1234)
?"i= "; i

--Kevin

[greubel]

From the docs.

8.5 Instr(position to start As Integer, text-to-search As String, substring-to-find As String) As Integer
Returns the position of a substring within a string. Returns 0 if the substring is not found. The first position is 1.

So for this, I would assume that the start is also 1.

[tdurrant420]

You are reading it wrong. The system is zero based. If you tell it to start looking at character 1, it will start looking AFTER character 1, not at. You need to always minus one from where you want to start.

[TheEndless]

The standalone InStr() function is 1 based. The .InStr() method of the roString object is 0 based. No idea why they're different.

Example:

myStr = "test"
InStr( myStr, "t" ) = 1
myStr.InStr( "t" ) = 0

[greubel]

Ok, if I start at zero and it returns zero, is that a no find ?

[TheEndless]

"greubel" wrote:
Ok, if I start at zero and it returns zero, is that a no find ?

If using the .InStr() method (ex. myStr.Instr("test")), then -1 is no match, 0 is match at first character.
And to expand.. myStr.InStr(1, "t") = 3