code: @Nonnull
    public static Matcher getMatcher (@Nonnull @RegEx final String sRegEx, @Nonnull final String sValue)
    {
      ValueEnforcer.notNull (sValue, "Value");
  
      return RegExCache.getPattern (sRegEx).matcher (sValue);
    }
docs: Get the Java Matcher object for the passed pair of regular expression and
  value.
  
  @param sRegEx
  The regular expression to use. May neither be <code>null</code> nor
  empty.
  @param sValue
  The value to create the matcher for. May not be <code>null</code>.
  @return A non-<code>null</code> matcher.