id允许大写字母(兼容老用户)

ask.py

@@ -77,7 +77,7 @@ def root():
 @limiter.limit("10 / minute")
 def set_inbox():
     acct = request.form.get('username')
-    if not re.match('[a-z0-9_]{1,30}(@[a-z\.-_]+)?', acct):
+    if not re.match('[A-Za-z0-9_]{1,30}(@[a-z\.-_]+)?', acct):
         return '无效的闭社id', 422
 
     r = th.conversations()

static/ask.html

@@ -72,7 +72,7 @@
 						<div class="input-group-prepend">
 							<div class="input-group-text">@</div>
 						</div>
-						<input type="text" class="form-control" id="username" placeholder="用户名" required="required" pattern="[a-z0-9_]{1,30}(@[a-z\.-_]+)?">
+						<input type="text" class="form-control" id="username" placeholder="用户名" required="required" pattern="[A-Za-z0-9_]{1,30}(@[a-z\.-_]+)?">
 					</div>
 					<button id="send" type="submit" class="btn btn-primary mb-2">我已私信</button>
 				</form>