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Check if a string matches a regular expression
Display
"ok" if "Hello" matches /[A-Z][a-z]+/
ruby
puts "ok" if ("Hello"=~/^[A-Z][a-z]+$/)
Check if a string matches with groups
Display
"two" if "one two three" matches /one (.*) three/
ruby
puts $1 if "one two three"=~/^one (.*) three$/
