add Gargantext.Utils.Regex for low level regex work

src/Gargantext/Utils/Regex.js

+function _cloneRegex(r) { return new RegExp(r.source, r.flags); }
+function _getRegexLastIndex(r) { return r.lastIndex; }
+function _execRegex(r, s) { return r.exec(s); }
+module.exports={
+    _cloneRegex: _cloneRegex,
+    _getRegexLastIndex: _getRegexLastIndex,
+    _execRegex: _execRegex
+};

src/Gargantext/Utils/Regex.purs

+-- | Utilities for working with regexes in a naughty mutable manner
+module Gargantext.Utils.Regex where
+
+import Effect (Effect)
+import Prelude ((<$>))
+import Data.Maybe (Maybe(..))
+import Effect.Uncurried (EffectFn2, runEffectFn2)
+import Data.Function.Uncurried (Fn1, runFn1)
+import Data.Nullable (Nullable, toMaybe)
+import Data.String.Regex (Regex)
+
+foreign import _cloneRegex :: Fn1 Regex Regex
+foreign import _getRegexLastIndex :: Fn1 Regex Int
+foreign import _execRegex :: EffectFn2 Regex String (Nullable String)
+
+cloneRegex :: Regex -> Regex
+cloneRegex = runFn1 _cloneRegex
+getRegexLastIndex :: Regex -> Int
+getRegexLastIndex = runFn1 _getRegexLastIndex
+execRegex :: Regex -> String -> Effect (Maybe String)
+execRegex r s = toMaybe <$> runEffectFn2 _execRegex r s
+