📄 number.awk
字号:
# determine whether the input is a number
# print it if it is
# AKW p40
BEGIN {
sign = "[+-]?"
decimal = "[0-9]+[.]?[0-9]*"
fraction = "[.][0-9]+"
exponent = "([eE]" sign "[0-9]+)?"
number = "^" sign "(" decimal "|" fraction ")" exponent "$"
}
$0 ~ number
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