add under2camel, camel2under, and slugify (and split_punct_ws, which is much faster than re-based punctuation splitting)

boltons/strutils.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+import re
+import string
+
+_camel2under_re = re.compile('((?<=[a-z0-9])[A-Z]|(?!^)[A-Z](?=[a-z]))')
+_punct_ws_str = string.punctuation + string.whitespace
+
+
+def slugify(text, delim='_'):
+    return delim.join(split_punct_ws(text).lower())
+
+
+def split_punct_ws(text, _punct=_punct_ws_str):
+    return [w for w in text.split(_punct) if w]
+
+
+def camel2under(string):
+    return _camel2under_re.sub(r'_\1', string).lower()
+
+
+def under2camel(string):
+    return ''.join(w.capitalize() or '_' for w in string.split('_'))