How to use -like for string in uppercase and lowercase

hello

i using following if else statement functionality same type of text i.e. cached. there way use 1 common statement?

if($oldfilename -like "*cached*")   	{  		$oldfilename=$oldfilename.replace('\cached','')                              	}  if ($oldfilename -like "*cached*")  	{  		$oldfilename=$oldfilename.replace('\cached','')  }

its regex need 2 "\\" replace one.

'\\cached\mydocuments\ak.txt' -replace '\\\\cached'

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\_(ツ)_/

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