In fact, comparing stringgetpos, splitpath, and regexmatch:
Code:
folder := "C:\foldera\folderb\"
num = 10000
TickCount()
Loop % num
f := GetOneDirUp_splitpath( folder )
splitpath_time := TickCount()/1000
Loop % num
f := GetOneDirUp_regex( folder )
regex_time := TickCount()/1000
Loop % num
f := GetOneDirUp_stringgetpos( folder )
stringgetpos_time := TickCount()
Msgbox % "SplitPath: " splitpath_time " seconds`nRegex: " regex_time " seconds`nStringGetPos: " stringgetpos_time " seconds"
clipboard := "SplitPath: " splitpath_time " seconds`nRegex: " regex_time " seconds`nStringGetPos: " stringgetpos_time " seconds"
GetOneDirUp_regex( folder ) {
RegExMatch( folder, "(.*)(?=\\.+?)(?:\\(?!=.))?", up_a_dir )
if not up_a_dir ; we're already at a drive
return 0
return up_a_dir1
}
GetOneDirUp_splitpath( folder ) {
if subStr(Folder, 0) = "\"
StringTrimRight, Folder, Folder, 1
SplitPath,Folder,,Folder
return folder
}
GetOneDirUp_stringgetpos( folder ) {
StringGetPos, index, Folder, % "\", R, 1
index++
if index
return subStr(Folder, 1, index)
}
TickCount() {
Static LastCount
Return (A_TickCount-LastCount)/1000, LastCount := A_TickCount
}
Setting num to 10000 gives me:
Quote:
SplitPath: 0.000031 seconds
Regex: 0.000250 seconds
StringGetPos: 0.063000 seconds
Setting num to 100000 gives me:
Quote:
SplitPath: 0.000625 seconds
Regex: 0.002875 seconds
StringGetPos: 0.625000 seconds
Splitpath is consisently the fastest, but unless you're running millions of these, you're not seeing any performance differences between splitpath and regex. StringGetPos, weirdly, is slower by a factor of several hundred. I guess mainly I'm pointing out that regular expressions are actually pretty darn fast.
@Sinkfaze
I wonder what causes the differences in performance between your regex and mine. I'd guess it's using the named subpatterns?
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