awk - Replace newlines between two words -

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i have output text file below. want put contents of someitems array under 1 line. so, every line have contents of new someitems array. example : 

"someitems": [ {   "someid": "mountsomers-showtime.com-etti0000000000000003-1452005472058",   "source": "mountsomers",   "sourceassetid": "9",   "title": "pk_3",   "ppp": "12",   "expirationdate": "2016-01-06t14:51:12z" },    {   "someid": "mountsomers-ericsson.com- etti0000000000000005-1452005472058",   "source": "mountsomers",   "sourceassetid": "12",   "title": "pk_5",   "ppp": "12",   "expirationdate": "2016-01-06t14:51:12z" }  ] "someitems": [ {   "someid": "mountsomers-hbo.com-etti0000000000000002-1452005472058",   "source": "mountsomers",   "sourceassetid": "7",   "title": "pk_2",   "ppp": "12",   "expirationdate": "2016-01-06t14:51:12z" },    {   "someid": "mountsomers-showtime.com-etti0000000000000003-1452005472058",   "source": "mountsomers",   "sourceassetid": "9",   "title": "pk_3",   "ppp": "12",   "expirationdate": "2016-01-06t14:51:12z" },    {   "someid": "mountsomers-ericsson.com-etti0000000000000005-1452005472058",   "source": "mountsomers",   "sourceassetid": "12",   "title": "pk_5",   "ppp": "12",   "expirationdate": "2016-01-06t14:51:12z" }  ]

would become 

"someitems": [ ..... ] "someitems": [ ..... ]

i have below 

cat file | | awk '/^"someitems": [/{p=1}/^]/{p=0} {if(p)printf "%s",$0;else printf "%s%s\n",(nr==1?"":rs),$0}'

but not wanted...

since input contains brackets [] in outer level solution can pretty simple:

awk '{gsub("\n","", $0)}1' rs=']\n' file

i'm using ]\n input record separator. gives whole portion between "someitems: ..." until closing ] $0. gsub() replaces newlines. 1 prints (modified) record.

you can use sed:

sed '/\[/{:a;n;/]/!ba;s/\n//g}' file

i'll explain in multiline version:

script.sed:

# address. matches line containing opening [ /\[/ { # start of block      # define label 'a'     :a      # read new line , append pattern buffer     n      # if pattern buffer doens't contain closing ]     # jump label 'a'     /]/!ba      # replace newlines once closing bracket appeared     # since don't jump 'a' in case, means we'll     # leave block , start new cycle.     s/\n//g  } # end of block

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