grep single line from multiline string

Question

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

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Answer 1

string.lines.grep /pattern/

or

string.each_line.grep /pattern/

which might be more efficient

grep single line from multiline string

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