diff --git a/plugins/ChannelStats/plugin.py b/plugins/ChannelStats/plugin.py
index 0f0e3482b..028e05335 100644
--- a/plugins/ChannelStats/plugin.py
+++ b/plugins/ChannelStats/plugin.py
@@ -297,6 +297,7 @@ class ChannelStats(callbacks.Plugin):
                              name, channel))
     stats = wrap(stats, ['channeldb', additional('something')])
 
+    _calc_match_forbidden_chars = re.compile('[_[\]]')
     _env = {'__builtins__': types.ModuleType('__builtins__')}
     _env.update(math.__dict__)
     @internationalizeDocstring
@@ -311,7 +312,7 @@ class ChannelStats(callbacks.Plugin):
         """
         # XXX I could do this the right way, and abstract out a safe eval,
         #     or I could just copy/paste from the Math plugin.
-        if expr != expr.translate(utils.str.chars, '_[]'):
+        if self._calc_match_forbidden_chars.match(expr):
             irc.error(_('There\'s really no reason why you should have '
                       'underscores or brackets in your mathematical '
                       'expression.  Please remove them.'), Raise=True)
diff --git a/plugins/Filter/plugin.py b/plugins/Filter/plugin.py
index 3ed19c3ce..345553ba9 100644
--- a/plugins/Filter/plugin.py
+++ b/plugins/Filter/plugin.py
@@ -656,7 +656,7 @@ class Filter(callbacks.Plugin):
 
         Returns <text> with the l's made into r's and r's made into l's.
         """
-        text = text.translate(self._azn_trans)
+        text = self._azn_trans(text)
         irc.reply(text)
     azn = wrap(azn, ['text'])
 
diff --git a/plugins/Math/plugin.py b/plugins/Math/plugin.py
index 00a78cf67..bf87eef02 100644
--- a/plugins/Math/plugin.py
+++ b/plugins/Math/plugin.py
@@ -148,6 +148,8 @@ class Math(callbacks.Plugin):
         else:
             return '%s%s' % (realS, imagS)
 
+    _calc_match_forbidden_chars = re.compile('[_[\]]')
+    _calc_remover = utils.str.MultipleRemover('_[] \t')
     ###
     # So this is how the 'calc' command works:
     # First, we make a nice little safe environment for evaluation; basically,
@@ -167,12 +169,12 @@ class Math(callbacks.Plugin):
         crash to the bot with something like '10**10**10**10'.  One consequence
         is that large values such as '10**24' might not be exact.
         """
-        if text != text.translate(utils.str.chars, '_[]'):
+        if self._calc_match_forbidden_chars.match(text):
             irc.error(_('There\'s really no reason why you should have '
                            'underscores or brackets in your mathematical '
                            'expression.  Please remove them.'))
             return
-        #text = text.translate(utils.str.chars, '_[] \t')
+        text = self._calc_remover(text)
         if 'lambda' in text:
             irc.error(_('You can\'t use lambda in this command.'))
             return
@@ -221,14 +223,14 @@ class Math(callbacks.Plugin):
         math, and can thus cause the bot to suck up CPU.  Hence it requires
         the 'trusted' capability to use.
         """
-        if text != text.translate(utils.str.chars, '_[]'):
+        if self._calc_match_forbidden_chars.match(text):
             irc.error(_('There\'s really no reason why you should have '
                            'underscores or brackets in your mathematical '
                            'expression.  Please remove them.'))
             return
         # This removes spaces, too, but we'll leave the removal of _[] for
         # safety's sake.
-        text = text.translate(utils.str.chars, '_[] \t')
+        text = self._calc_remover(text)
         if 'lambda' in text:
             irc.error(_('You can\'t use lambda in this command.'))
             return
diff --git a/plugins/Unix/plugin.py b/plugins/Unix/plugin.py
index e8ccdf635..839826c84 100644
--- a/plugins/Unix/plugin.py
+++ b/plugins/Unix/plugin.py
@@ -48,6 +48,7 @@ import supybot.callbacks as callbacks
 from supybot.i18n import PluginInternationalization, internationalizeDocstring
 _ = PluginInternationalization('Unix')
 
+_progstats_endline_remover = utils.str.MultipleRemover('\r\n')
 def progstats():
     pw = pwd.getpwuid(os.getuid())
     response = format('Process ID %i running as user %q and as group %q '
@@ -55,7 +56,7 @@ def progstats():
                       'Running on Python %s.',
                       os.getpid(), pw[0], pw[3],
                       os.getcwd(), ' '.join(sys.argv),
-                      sys.version.translate(utils.str.chars, '\r\n'))
+                      _progstats_endline_remover(sys.version))
     return response
 
 class TimeoutError(IOError):