从多行字符串grep单行 [英] grep single line from multiline string

问题描述

变量 str 包含多行字符串。我想从它那里弄出一条线。我想grep字符串行 kernel release 721 并将它分配给一个变量。有没有办法做到这一点？

A variable str holds a multi line string. I want to grep a line from it. I want to grep the string line kernel release 721 and assign it to a variable. Is there any way to do so?

irb(main):152:0> print str
*************************** Component ********************
c:\temp\agent\bin\CAR.exe: 721, patch 618, changelist 1633822, NTAMD64, opt
**********************************************************
--------------------
AGENT information
--------------------

kernel release                721

kernel make variant           721_REL

compiled on                   NT 6.1 7601 S x86 MS VC++ 14.00 for NTAMD64

compiled for                  64 BIT

compilation mode              Non-Unicode

compile time                  Mar 21 2016 21:07:50

patch number                  12

latest change number          1659167


---------------------
supported environment
---------------------

operating system
Windows NT 5.0
Windows NT 5.1
Windows NT 5.2
Windows NT 6.0
Windows NT 6.1

推荐答案

string.lines.grep /pattern/

或

or

string.each_line.grep /pattern/

这可能更有效率

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