File: gsubtest.awk

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gawk 3.0.3-1
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BEGIN {
	str = "abc"; gsub("b+", "FOO", str); print str
	str = "abc"; gsub("x*", "X", str); print str
	str = "abc"; gsub("b*", "X", str); print str
	str = "abc"; gsub("c", "X", str); print str
	str = "abc"; gsub("c+", "X", str); print str
	str = "abc"; gsub("x*$", "X", str); print str
}