diff --git a/atlassian/jira.py b/atlassian/jira.py
index <HASH>..<HASH> 100644
--- a/atlassian/jira.py
+++ b/atlassian/jira.py
@@ -735,7 +735,7 @@ class Jira(AtlassianRestAPI):
         :param list issue_list:
         :return:
         """
-        jira_issue_regex = re.compile(r"[A-Z]{1,10}-\d+")
+        jira_issue_regex = re.compile(r"\w+-\d+")
         missing_issues = list()
         matched_issue_keys = list()
         for key in issue_list:
[Jira] Do not filter project keys too aggressively. (#<I>)