At first, check below points.
* Fix variable name "text" to "line".
* HELLO is not a "grobal variable", this name is a "constant".
Next, try this code.
if /^#{HELLO}\s+.*$/ =~ line
puts "#{HELLO} found"
end
"(?:)" has other meanings in regex literals.
Use "#{expr}" for substitutions in string and regex literals.
Last, This documents for you.
http://ruby-doc.org/docs/ProgrammingRuby/html/language.html
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