Fix #2033 - Allow regexp in if expression

This changeset introduces regexp in if expression with the use of the
=~ (match) and !~ (not match) operator.

Usage:

if $uname =~ /Linux|Debian/ {
  ...
}

Moreover this patch creates ephemeral variables ($0 to $9) in the current
scope which contains the regex captures:
if $uname =~ /(Linux|Debian)/ {
  notice("this is a $1 system")
}

Signed-off-by: Brice Figureau <brice-puppet@daysofwonder.com>

2 files changed, 12 insertions, 6 deletions

diff --git a/test/data/snippets/ifexpression.pp b/test/data/snippets/ifexpression.pp
new file mode 100644
index 000000000..29a637291
--- /dev/null
+++ b/test/data/snippets/ifexpression.pp
@@ -0,0 +1,12 @@
+$one = 1
+$two = 2
+
+if ($one < $two) and (($two < 3) or ($two == 2)) {
+    notice("True!")
+}
+
+if "test regex" =~ /(.*) regex/ {
+    file {
+        "/tmp/${1}iftest": ensure => file, mode => 0755
+    }
+}
diff --git a/test/data/snippets/ifexpression.rb b/test/data/snippets/ifexpression.rb
deleted file mode 100644
index eea3b855b..000000000
--- a/test/data/snippets/ifexpression.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-$one = 1
-$two = 2
-
-if ($one < $two) and (($two < 3) or ($two == 2)) {
-    notice("True!")
-}