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replace ( haystack_string_expression , fromstring_expr , tostring_expr )
replace ( haystack_string_expression , fromstring_Expr , tostring_expr , caseinsensitive)

returns String_value

Return a new string where all occurrences or fromstring are replaced by tostring in the string haystack. You may also specify an optional boolean value caseinsensitive to specify that the search will treat upper and lower case letters the same.

a$ = "We all live in a yellow submarine, yellow submarine, yellow submarine."
print Replace(a$,"yellow","blue")
print Replace(a$, "we", "Beatles", true)

will display

We all live in a blue submarine, blue submarine, blue submarine.
Beatles all live in a yellow submarine, yellow submarine, yellow submarine.