问题
So I'm playing around with Compare-Object, and it works fine for comparing files. But what about just strings? Is there a way to find the difference between strings? CompareTo() is good about reporting that there is a difference, but not what the difference is. For example:
PS:> $a = "PowerShell rocks"
PS:> $b = "Powershell rocks"
PS:> $a.CompareTo($b)
1
PS:> Compare-Object -ReferenceObject $a -DifferenceObject $b
PS:>
Nothing returned.
Any way to let me know about the actual difference between the strings, not just that there is a difference?
回答1:
Perhaps something like this:
function Compare-String {
param(
[String] $string1,
[String] $string2
)
if ( $string1 -ceq $string2 ) {
return -1
}
for ( $i = 0; $i -lt $string1.Length; $i++ ) {
if ( $string1[$i] -cne $string2[$i] ) {
return $i
}
}
return $string1.Length
}
The function returns -1 if the two strings are equal or the position of the first difference between the two strings. If you want case-insensitive comparisons, you would need to use -eq
instead of -ceq
and -ne
instead of -cne
.
来源:https://stackoverflow.com/questions/25169424/using-powershell-to-find-the-differences-in-strings