问题
I have this paragraph (may be I have more than one paragraph)
=> "On the server side,\n\nmy EJB3 application uses Spring for configuring all sorts of things. So,\n\nmy EJBs all look up various ApplicationContexts and use them as a sort of\r\nwell, I was going to say poor man's JNDI, but the reality is that JNDI in the J2EE environment is really a poor man's Spring. :-)\n\nOn the GUI side,\n\nI use it instead of resource injection to get access to my EJBs.\n\nThat lets me test the GUI component with simple pojos.\n\nHope that helps."
on irb, I am assign it into x
x = %q{On the server side,\n\nmy EJB3 application uses Spring for configuring all sorts of things. So,\n\nmy EJBs all look up various ApplicationContexts and use them as a sort of\r\nwell, I was going to say poor man's JNDI, but the reality is that JNDI in the J2EE environment is really a poor man's Spring. :-)\n\nOn the GUI side,\n\nI use it instead of resource injection to get access to my EJBs. \n\nThat lets me test the GUI component with simple pojos.\n\nHope that helps.}
as per carriage return (\r) and new line (\n), I need only these details from above paragraph, any Idea How can I do that?
my EJB3 application uses Spring for configuring all sorts of things. So,...my EJBs all look up various ApplicationContexts and use them as a sort of...I use it instead of resource injection to get access to my EJBs....
very simple way - let's say I have a\nabc\r\nd\r\nab\neba and search keyword is b, I need only abcabeba
回答1:
I don't know how <em>\1</em> is relevant here, but probably, you want this, I suppose.
x.scan(/.*ejb.*/i).join("...")
Note that the regex is in single-line mode.
Or, if you are doing this on Linux, and still need to deal with (not only \n but also) \r, then this might be safer:
x.scan(/[^\n\r]*ejb[^\n\r]*/i).join("...")
回答2:
s = eval("%q{a\nabc\r\nd\r\nab\neba}")
p s.split("\n").select{|x| x.include? 'b'}.join('')
#=>"abcabeba"
来源：https://stackoverflow.com/questions/16198602/truncate-line-before-and-after-cariage-return-r-or-new-line-n-with-ellipse