pw_presubmit: Find more inclusive language issues

Find cases where a banned word, e.g., "banned" is inside a larger
identifier, like "FooBannedBar". Assuming there are initial caps in the
identifier, "Banned" will be found and presented as an issue.

Change-Id: Ib1b4a2e2f805cc55aeec4afb6087e4c09c4e6c68
Bug: 386
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48563
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Joe Ethier <jethier@google.com>

pw_presubmit/py/pw_presubmit/inclusive_language.py

diff --git a/pw_presubmit/py/pw_presubmit/inclusive_language.py b/pw_presubmit/py/pw_presubmit/inclusive_language.py
index a751954..087fe58 100644
--- a/pw_presubmit/py/pw_presubmit/inclusive_language.py
+++ b/pw_presubmit/py/pw_presubmit/inclusive_language.py
@@ -65,10 +65,12 @@
     for word in all_words:
         _ = re.compile(word)
 
+    word_boundary = (
+        r'(\b|_|(?<=[a-z])(?=[A-Z])|(?<=[0-9])(?=\w)|(?<=\w)(?=[0-9]))')
+
     return re.compile(
-        r"(\b|_)({})(\b|_|e?[sd]_?\b)".format('|'.join(all_words)),
-        re.IGNORECASE,
-    )
+        r"({b})(?i:{w})(e?[sd]{b}|{b})".format(w='|'.join(all_words),
+                                               b=word_boundary), )
 
 
 NON_INCLUSIVE_WORDS_REGEX = _process_inclusive_language()