[PATCH v2] checkpatch: fix TYPO_SPELLING check for words with apostrophe

[Dwaipayan Ray]

checkpatch reports a false TYPO_SPELLING warning for some words
containing an apostrophe when run with --codespell option.

A false positive is "doesn't". Occurrence of the word causes
checkpatch to emit the following warning:

"WARNING: 'doesn'' may be misspelled - perhaps 'doesn't'?"

Modify the regex pattern to be more in line with the codespell
default word matching regex. This fixes the word capture and
avoids the false warning.

Suggested-by: Joe Perches <joe@xxxxxxxxxxx>
Reported-by: Peilin Ye <yepeilin.cs@xxxxxxxxx>
Signed-off-by: Dwaipayan Ray <dwaipayanray1@xxxxxxxxx>
---
Changes in v2:
- Use the default codespell word regex.
- Modify commit message to specify --codespell usage

 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3c86ea737e9c..bd6304f93e0a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3106,7 +3106,7 @@ sub process {
 # Check for various typo / spelling mistakes
 		if (defined($misspellings) &&
 		    ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
-			while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:\b|$|[^a-z@])/gi) {
+			while ($rawline =~ /(?:^|[^\w\-'`])($misspellings)(?:[^\w\-'`]|$)/gi) {
 				my $typo = $1;
 				my $typo_fix = $spelling_fix{lc($typo)};
 				$typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
-- 
2.27.0