Same results as before, except that, as for a 100-character string length, the regex performs much better when removing the first character compared to the last. Average (ms) Count Sum (ms) Maximum (ms) Minimum (ms) PS C:\temp> C:\Dropbox\PowerShell\temp2.ps1 Regex -replace quite a bit slower with a longer string. SubString() and Remove() together at the top. Longer line, still few characters removed/addedString length: 1000. Removing $n $(if($RemoveLast) -Title `ĪrraySubString, ArrayForeachObjSubStr, ArrayRegex | ft -AutoSize Write-Host -ForegroundColor Cyan "String length: $($String.Length). Import-Module Benchmark # My PowerShell benchmarking module. Here is a link to my benchmarking module that I use to get the "Measure-These" command. There will be little spoonfeeding (I said "for developers" initially).
PHP TRIM LAST 4 CHARACTERS CODE
In my experience, foreach loops outperform ForEach-Object consistently – at the expense of enumerating the entire collection at once, and probably using more memory.Ĭode to test speed differencesStudy this code to see how I replace the first and last n characters. It does not on removing the '''last''' character(s).īeware, however, that if you use a pipeline ForEach-Object instead, it will in fact be slower than the -replace.
There is also an exception with a collection (1000 repeated, identical strings) and removing the '''first''' one or 50 characters from a 100-character string, where the -replace operator does actually outperform SubString(). Tl dr: () or () win (almost) consistently, perform almost equivalently during my testing, and should be used if the action is repeated a lot and/or performance is important – even on arrays/collections, where it can outperform how -replace works on collections, if you throw in a foreach loop.
Results of using the 4 different methods are benchmarked and compared to find the fastest way possible given both single strings and string arrays/collections given a few different scenarios.
PHP TRIM LAST 4 CHARACTERS HOW TO
This ought to be a good guide for developers on how to remove the first or last n characters from a string in PowerShell.
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