one liner append line(s) to matched paragraph

PeteInPDX has asked for the wisdom of the Perl Monks concerning the following question:

data
-------------------------
para1 foo bar
para1 some stuff

para2 other stuff
para2 foo bar

para3 this is enough
-------------------------

if paragraph's lines start with para2, then append
new line(s) to that paragraph

desired
-------------------------
para1 foo bar
para1 some stuff

para2 other stuff
para2 foo bar
para2 NEW STUFF

para3 this is enough
-------------------------

going nuts with trying to set -F to \n\n or using -00
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Comment on one liner append line(s) to matched paragraph Download Code

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Re: one liner append line(s) to matched paragraph by hippo (Archbishop) on Aug 25, 2015 at 23:01 UTC
`perl -pe '$n = 1 if /^para2/; print "para2 NEW STUFF\n" if $n && /^$/;'` seems to do the trick for me. HTH.	[reply] [d/l]
Re: one liner append line(s) to matched paragraph by shmem (Chancellor) on Aug 26, 2015 at 06:32 UTC
`perl -p00 -le '$_.="\npara2 NEW STUFF" if /^para2/' filename` [download] perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'	[reply] [d/l]
Re: one liner append line(s) to matched paragraph by 1nickt (Canon) on Aug 25, 2015 at 23:11 UTC
Here's one way to do it with a regexp: `# cat 1139933.dat para1 foo bar para1 some stuff para2 other stuff para2 foo bar para2 extra stuff para3 this is enough #` [download] `# perl -Mstrict -wne' $/ = ""; s/^(para2.)^$/$1new text\n/ms; print; ' 1139933.dat para1 foo bar para1 some stuff para2 other stuff para2 foo bar new text para2 extra stuff new text para3 this is enough #` [download] Update: new solution; hippo beat me to my first idea* The way forward always starts with a minimal test.	[reply] [d/l] [select]