Replacing only the first occurrence of a word in a string

Question

I am having some issues with regular expression mainly because I think the information I can find is not specifically for powershell and all the samples I have tried either

Answer 1

One way to replace n times:

$test = "My name is Bob, her name is Sara."
[regex]$pattern = "name"
$pattern.replace($test, "baby", 1) 

> My baby is Bob, her name is Sara