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Short description	Returns a text copy of s where the first substring matching the given regular expression regexp has been replaced with the given replacement string.
Output
Available since

The function returns a text copy of s where the first substring matching the given regular expression regexp has been replaced with the given replacement string.

replaceFirst(string s, string regexp, string replacement) #Output : Text

Parser expression Description

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

The function returns a text : "He_lo World"

Parameters used in this function

Parameter	Input (data type)	Description
`xxx`		Parameter description.
`xxx`		Parameter description.
`xxx`		Parameter description.

This function returns a