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What is the s/findthis/replacewiththis syntax called?

what is the s/find/replace syntax called?


that's called search and replace with regular expressions

ed is the line editor used by vi [which includes this]
sed is just a stream version of ed

s is the substitution command.

Searched words: 
sed "stream editor" line editor vim text replacement search and change


Use of the search-replace regex

is covered in a very comprehensive Sed tutorial:

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