vb.net - Instr question

what does tstrx equal below?
dim tstrx as string = ""
dim strx as string = "http://shjdhncha/shgb/default.aspx"
tstrx = Mid(strx, 1 InStr(strx, "xxx") -1
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GlobaLevelProgrammerAsked:
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tyy8Commented:
This would cause an error
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tyy8Commented:
Sorry (should have added)

InStr(strx, "xxx") - 1

InStr(strx, "xxx")  is 0
InStr(strx, "xxx") - 1 is -1

There is no such point in the string as -1
0
nmarunCommented:
0
13598Commented:
Your length
tstrx = Mid(strx, 1, InStr(strx, "xxx") - 1)
would be 0 and you cannot have a 0 length.
It would be 0 because you are looking for 3 x in a row which don't exist in "http://shjdhncha/shgb/default.aspx"
 
What is your goal here?
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ZhaolaiCommented:
tstrx = Mid(strx, 1 InStr(strx, "xxx") -1
 produces two syntax errors, because it's missing a comma before InStr and missing a closing parenthesis ")" at the end.
 
 
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