lang: funcs: Add regexp package and match function

This adds a simple regexp match function. This will be useful for
regexp based name classification, if you're into that sort of thing.

lang/funcs/core/regexp/regexp.go

@@ -0,0 +1,23 @@
+// Mgmt
+// Copyright (C) 2013-2019+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package coreregexp
+
+const (
+	// moduleName is the prefix given to all the functions in this module.
+	moduleName = "regexp"
+)