How to replace the first occurrence of a string in a file using sed

Finding a solution for this was bordering on ridiculous, no matter how I put it… “replace using non greedy”, “replace only one instance of a string”, “replace first string match only” I struggled to find an answer. The man page had no information on this either.
After a while I came up with the following solution.

sed ‘0,/this/s//to_that/’ filename.txt

After tweeting for some help on how this actually works, a colleague sent me the following link

http://www.grymoire.com/Unix/Sed.html

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