Apache2，PHP 7.1，mod_rewrite，.htaccess 404

Question

您好，我似乎遇到了一些mod_rewrite的问题。

.htaccess正在/欢迎来自/welcome.php;

重写网址

但他们正在返回404错误。

的Apache2 PHP 7.1 MySQL 5.8 mod_rewrite已启用并加载

有人可以帮助我完全失去了吗？

    <IfModule mod_rewrite.c>
RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

#For removing extension as Options +MultiViews not working with RewriteRule
RewriteRule ^([a-zA-Z0-9_]+)$ $1.php [QSA,NC,L]

RewriteRule ^profile/([a-zA-Z0-9._@\-]+)$ profile.php?u=$1 [QSA,NC,L]
RewriteRule ^profile/ profile.php [QSA,NC,L]

RewriteRule ^groups/([0-9]+)$ groups.php?grp=$1 [QSA,NC,L]
RewriteRule ^groups/ groups.php [QSA,NC,L]

RewriteRule ^view_post/([a-zA-Z0-9]+)$ view_post.php?post=$1 [QSA,NC,L]

ErrorDocument 404 /404.php

#DirectoryIndex Options +Indexes

<FilesMatch ".(htaccess)">
  order allow,deny
  deny from all
</FilesMatch>

#Options +MultiViews

IndexIgnore *
</IfModule>

这是我的.htaccess文件。