请向我指出,如何为我购买像<代码>(?<=id=)[0-9]等配对机。
我也希望从管道获得投入,这将是一条单一的案文。
to print solely the matched expressions
(not the entire line, several expressions within the same line may be displayed)
yourcommand | grep -P -o (?<=id=)[0-9]
b 定期表示可比较。 你们可以 use:
grep -P -o (?<=id=)[0-9]
And in a pipeline:
number=$(echo "foo id=3 bar" | grep -Po (?<=id=)[0-9] )
echo $number # => 3
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