PowerShell multiple string replacement efficiency

Question

I\'m trying to replace 600 different strings in a very large text file 30Mb+. I\'m current building a script that does this; following this Question:

Script:

Answer 1

I also have no idea how to solve this in powershell, but I do know how to solve it in Bash and that is by using a tool called sed. Luckily, there is also Sed for Windows. If all you want to do is replace "something#" with "somethingelse#" everywhere then this command will do the trick for you

sed -i "s/something([0-9]+)/somethingelse\1/g" c:\log.txt

In Bash you'd actually need to escape a couple of those characters with backslashes, but I'm not sure you need to in windows. If the first command complains you can try

sed -i "s/something\([0-9]\+\)/somethingelse\1/g" c:\log.txt