diff --git a/app/hstrrand.hs b/app/hstrrand.hs
new file mode 100644
--- /dev/null
+++ b/app/hstrrand.hs
@@ -0,0 +1,24 @@
+{-# LANGUAGE Strict #-}
+module Main (main) where
+
+import Data.Monoid ((<>))
+import qualified Options.Applicative as Options
+import qualified Data.Text as Text
+import qualified Data.Text.IO as Text
+import qualified Text.StringRandom as StringRandom
+
+argParser :: Options.Parser Text.Text
+argParser = Text.pack <$> Options.strArgument
+         ( Options.metavar "REGEXP"
+        <> Options.help "Regexp as a template (e.g. '[1-3]{2}random[!?]')"
+         )
+
+main :: IO ()
+main = do
+  pat <- Options.execParser opts
+  txt <- StringRandom.stringRandomIO pat
+  Text.putStrLn txt
+  where
+    opts = Options.info (Options.helper <*> argParser)
+      ( Options.fullDesc
+     <> Options.header "hstrrand - Generate string which matches REGEXP" )
diff --git a/string-random.cabal b/string-random.cabal
--- a/string-random.cabal
+++ b/string-random.cabal
@@ -1,60 +1,94 @@
-name:                string-random
-version:             0.1.0.0
-synopsis:            A library for generating random string from a regular experession
-description:         With this package you can generate random strings from
-                     regular expressions. If you are using QuickCheck, you can
-                     also check the quickcheck-string-random package.
-homepage:            https://github.com/hiratara/hs-string-random#readme
-license:             BSD3
-license-file:        LICENSE
-author:              Masahiro Honma
-maintainer:          hiratara@cpan.org
-copyright:           Copyright (C) 2016- hiratara
-category:            Text
-build-type:          Simple
-cabal-version:       >=1.10
-tested-with:         GHC ==8.0.1
+-- This file has been generated from package.yaml by hpack version 0.28.2.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: ee087fb3e5d9dd1de970f1bd3e7e170f27f5e2a692d7ccc9eb345548dab06c07
 
+name:           string-random
+version:        0.1.1.0
+synopsis:       A library for generating random string from a regular experession
+description:    With this package you can generate random strings from
+                regular expressions. If you are using QuickCheck, you can
+                also check the quickcheck-string-random package.
+category:       Text
+homepage:       https://github.com/hiratara/hs-string-random#readme
+bug-reports:    https://github.com/hiratara/hs-string-random/issues
+author:         Masahiro Honma
+maintainer:     hiratara@cpan.org
+copyright:      Copyright (C) 2016- hiratara
+license:        BSD3
+license-file:   LICENSE
+tested-with:    GHC==8.0.1
+build-type:     Simple
+cabal-version:  >= 1.10
+
+source-repository head
+  type: git
+  location: https://github.com/hiratara/hs-string-random
+
 library
-  hs-source-dirs:      src
-  exposed-modules:     Text.StringRandom
-                     , Text.StringRandom.Parser
-  build-depends:       base >= 4.9 && < 5
-                     , attoparsec >=0.13.1 && <0.14
-                     , containers >=0.5.7.1 && <0.6
-                     , random >=1.1 && <1.2
-                     , text >=1.2.2.1 && <1.3
-                     , transformers >=0.5.2.0 && <0.6
-  default-language:    Haskell2010
+  exposed-modules:
+      Text.StringRandom
+      Text.StringRandom.Parser
+  other-modules:
+      Paths_string_random
+  hs-source-dirs:
+      src
+  build-depends:
+      attoparsec >=0.13.1 && <0.14
+    , base >=4.9 && <5
+    , containers >=0.5.7.1 && <0.6
+    , random >=1.1 && <1.2
+    , text >=1.2.2.1 && <1.3
+    , transformers >=0.5.2.0 && <0.6
+  default-language: Haskell2010
 
-test-suite string-random-test
-  type:                exitcode-stdio-1.0
-  hs-source-dirs:      test
-  main-is:             string-random-test.hs
-  build-depends:       base
-                     , bytestring
-                     , pcre-heavy
-                     , string-random
-                     , tasty
-                     , tasty-hunit
-                     , text
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
-  default-language:    Haskell2010
+executable hstrrand
+  main-is: hstrrand.hs
+  other-modules:
+      Paths_string_random
+  hs-source-dirs:
+      app
+  ghc-options: -O2 -threaded -Wall
+  build-depends:
+      base >=4.9 && <5
+    , optparse-applicative
+    , string-random
+    , text
+  default-language: Haskell2010
 
 test-suite string-random-quickcheck
-  type:                exitcode-stdio-1.0
-  hs-source-dirs:      test
-  main-is:             string-random-quickcheck.hs
-  build-depends:       base
-                     , pcre-heavy
-                     , QuickCheck
-                     , string-random
-                     , tasty
-                     , tasty-quickcheck
-                     , text
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
-  default-language:    Haskell2010
+  type: exitcode-stdio-1.0
+  main-is: string-random-quickcheck.hs
+  other-modules:
+      Paths_string_random
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      QuickCheck
+    , base
+    , pcre-heavy
+    , string-random
+    , tasty
+    , tasty-quickcheck
+    , text
+  default-language: Haskell2010
 
-source-repository head
-  type:     git
-  location: https://github.com/hiratara/hs-string-random
+test-suite string-random-test
+  type: exitcode-stdio-1.0
+  main-is: string-random-test.hs
+  other-modules:
+      Paths_string_random
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base
+    , bytestring
+    , pcre-heavy
+    , string-random
+    , tasty
+    , tasty-hunit
+    , text
+  default-language: Haskell2010