beginnings of regular expression library.

will move elsewhere when more complete.
parses, does not execute.
no character classes yet.

R=rsc
DELTA=522  (522 added, 0 deleted, 0 changed)
OCL=16863
CL=16874

usr/r/regexp/Makefile

+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+A=6
+G=$(A)g
+L=$(A)l
+
+all: main
+
+main:	main.6
+	$L -o main main.6
+
+main.6: regexp.6
+
+clean:
+	rm -f *.6 main
+
+%.6:	%.go
+	$G $<

usr/r/regexp/main.go

+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"os";
+	"regexp";
+)
+
+func main() {
+	str := "a*b*c*";
+	if sys.argc() > 1 {
+		str = sys.argv(1);
+	}
+	re, err := regexp.Compile(str);
+	if err != nil {
+		print("error: ", err.String(), "\n");
+		sys.exit(1);
+	}
+}