CryptoPad Classic

String Comparisons
by Steven Noonan
June 15, 2005

Note: OPS = Operations Per Second

I actually wrote a function which improves the speed of StrComp if the strings are not of the same length (if the lengths aren't the same, it cannot be the same string). My function is called StringComp. You will see a huge difference in speed when we get to non-identical strings.

When doing string comparisons, and you want case insensitivity, you should always use StrComp, instead of an "if LCase$(StringOne) = LCase$(StringTwo)".

Below is a comparison of the speeds.

Identical Strings (Case insensitive)
LCase$(StringOne) = LCase$(StringTwo) StrComp(StringOne, StringTwo, vbTextCompare) = 0 StringComp(StringOne, StringTwo)
526,534 OPS 1,500,911 OPS 1,394,779 OPS

However, whenever you are doing a case-sensitive string comparison, you should use the StringOne = StringTwo, as it is significantly faster (shown below).

Identical Strings (Case sensitive)
StringOne = StringTwo StrComp(StringOne, StringTwovbTextCompare) = 0 StringComp(StringOne, StringTwo)
3,305,785 OPS 1,501,243 OPS 1,400,304 OPS

And if the strings are not identical (differential lengths), you do not see a dramatic difference between the methods, except for my StringComp method.

Non-Identical Strings (Case insensitive)
LCase$(StringOne) = LCase$(StringTwo) StrComp(StringOne, StringTwo, vbTextCompare) = 0 StringComp(StringOne, StringTwo)
510,484 OPS 1,369,553 OPS 15,010,511 OPS

Non-Identical Strings (Case sensitive)
StringOne = StringTwo StrComp(StringOne, StringTwo, vbTextCompare) = 0 StringComp(StringOne, StringTwo)
3,396,174 OPS 1,390,758 OPS 15,857,913 OPS


As is obvious, comparing the length before comparing the string will help the speed greatly.

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