quickly tossed here to get the ssh lib to work

coro/ssh/keys/rebuild.py

+# -*- Mode: Python -*-
+
+# utility functions for building regular expressions
+
+def OR (*args):
+    return '(?:' + '|'.join (args) + ')'
+
+def CONCAT (*args):
+    return '(?:' + ''.join (args) + ')'
+
+def NTIMES (arg, l, h):
+    return '(?:' + arg + '){%d,%d}' % (l, h)
+
+def OPTIONAL (*args):
+    return '(?:' + CONCAT(*args) + ')?'
+
+def PLUS (*args):
+    return '(?:' + CONCAT(*args) + ')+'
+
+def SPLAT (*args):
+    return '(?:' + CONCAT(*args) + ')*'
+
+def NAME (name, arg):
+    return '(?P<%s>%s)' % (name, arg)