File: gsubtest.awk

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gawk 1%3A4.1.4%2Bdfsg-1
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BEGIN {
	str = "abc"; print gsub("b+", "FOO", str), str
	str = "abc"; print gsub("x*", "X", str), str
	str = "abc"; print gsub("b*", "X", str), str
	str = "abc"; print gsub("c", "X", str), str
	str = "abc"; print gsub("c+", "X", str), str
	str = "abc"; print gsub("x*$", "X", str), str
	str = "abc"; print gsub("b|$", "X", str), str
}