BEGIN{FS=OFS=x}{for(i=p=0;$++i;$i=x)if((a=index(")]}>",$i))-index("([{<",s[p])){s[++p]=$i;if(a)break}else--p}$0=p?"failed at: "($0?$0:"EOL"):"yes"
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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