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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]+$/)
erlang
String = "Hello", Regexp = "[A-Z][a-z]+",
is_match(String, Regexp) andalso (begin io:format("ok~n"), true end).
case re:run("Hello", "[A-Z][a-z]+") of {match, _} -> ok end.
clojure
(if (re-matches #"[A-Z][a-z]+" "Hello")
(println "ok"))

Check if a string matches with groups

Display "two" if "one two three" matches /one (.*) three/
ruby
puts $1 if "one two three"=~/^one (.*) three$/
erlang
case re:run("one two three", "one (.*) three", [{capture, [1], list}]) of {match, Res} -> hd(Res) end.
clojure
(if-let [groups (re-matches #"one (.*) three" "one two three")]
(println (second groups)))