1 files changed, 52 insertions, 0 deletions
diff --git a/libbackend-elements/backend-elements/regex.txx b/libbackend-elements/backend-elements/regex.txx
new file mode 100644
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+++ b/libbackend-elements/backend-elements/regex.txx
@@ -0,0 +1,52 @@
+// file      : backend-elements/regex.txx
+// author    : Boris Kolpackov <boris@kolpackov.net>
+// copyright : Copyright (c) 2005-2010 Boris Kolpackov
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+namespace BackendElements
+{
+  namespace Regex
+  {
+    template <typename C>
+    Void Pattern<C>::
+    init (StringTemplate<C> const& r)
+    {
+      try
+      {
+        pat_ = r;
+      }
+      catch (boost::regex_error const& e)
+      {
+        throw Format<C> (r, e.what ());
+      }
+    }
+
+    //
+    //
+    template <typename C>
+    Void Expression<C>::
+    init (StringTemplate<C> const& r)
+    {
+      typedef StringTemplate<C> String;
+
+      if (r.empty ())
+        throw Format<C> (r, "empty expression");
+
+      C d (r[0]);
+
+      Size first (0);
+      Size middle (r.find (d, first + 1));
+
+      if (middle == String::npos)
+        throw Format<C> (r, "missing second pattern-substitution separator");
+
+      Size last (r.find (d, middle + 1));
+
+      if (last == String::npos)
+        throw Format<C> (r, "missing third pattern-substitution separator");
+
+      pat_ = String (r, first + 1, middle - first - 1);
+      sub_.assign (r, middle + 1, last - middle - 1);
+    }
+  }
+}