1 files changed, 40 insertions, 0 deletions
diff --git a/puppet/modules/stdlib/lib/puppet/parser/functions/validate_re.rb b/puppet/modules/stdlib/lib/puppet/parser/functions/validate_re.rb
new file mode 100644
index 00000000..ca25a702
--- /dev/null
+++ b/puppet/modules/stdlib/lib/puppet/parser/functions/validate_re.rb
@@ -0,0 +1,40 @@
+module Puppet::Parser::Functions
+  newfunction(:validate_re, :doc => <<-'ENDHEREDOC') do |args|
+    Perform simple validation of a string against one or more regular
+    expressions. The first argument of this function should be a string to
+    test, and the second argument should be a stringified regular expression
+    (without the // delimiters) or an array of regular expressions.  If none
+    of the regular expressions match the string passed in, compilation will
+    abort with a parse error.
+
+    If a third argument is specified, this will be the error message raised and
+    seen by the user.
+
+    The following strings will validate against the regular expressions:
+
+        validate_re('one', '^one$')
+        validate_re('one', [ '^one', '^two' ])
+
+    The following strings will fail to validate, causing compilation to abort:
+
+        validate_re('one', [ '^two', '^three' ])
+
+    A helpful error message can be returned like this:
+
+        validate_re($::puppetversion, '^2.7', 'The $puppetversion fact value does not match 2.7')
+
+    ENDHEREDOC
+    if (args.length < 2) or (args.length > 3) then
+      raise Puppet::ParseError, ("validate_re(): wrong number of arguments (#{args.length}; must be 2 or 3)")
+    end
+
+    msg = args[2] || "validate_re(): #{args[0].inspect} does not match #{args[1].inspect}"
+
+    # We're using a flattened array here because we can't call String#any? in
+    # Ruby 1.9 like we can in Ruby 1.8
+    raise Puppet::ParseError, (msg) unless [args[1]].flatten.any? do |re_str|
+      args[0] =~ Regexp.compile(re_str)
+    end
+
+  end
+end