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Short description	Replaces only the first substring matching the given regular expression with the given replacement.
Output
Available since

This function replaces the first substring matching the given regular expression with the given replacement.

replaceFirst(text, regexp, replacement) #Output : Text

Parser expression Description

replaceFirst("Hello World", "l", "_")

The function returns a text : "He_lo World"

Parameter	Input (data type)	Description
`text`		Any given text.
`regexp`		A valid regeular expression that grabs the substring to be replaced.
`replacement`		This text will replace the substring found by the regexp.

This function returns a

If you want to replace all matching occurrences with the replacement, have a look at the replaceAll() function.

replaceFirst("Hello World", "l", "_")	replaceAll("Hello World", "l", "_")
"He_lo World"	"He__o World"