Regexp - exclude pattern using negative lookahead [duplicate] - regex

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I've inside my company a deployment process called XL-Deploy.
XL-Deploy give me possibility to replace some mustach variable by value stored in XL-Deploy library
like Jenkins for comparison.
My problem with this application come with file extension. Yes, XL-Deploy need to specify using regexp wich file type need to be scan for variable replacement.
I'm not a pro with regexp but my company give me this regexp work perfectly when file are basic (foo.bar, index.php, test.html, etc..) but in my case not working because my config file name is config.ini.php.
I've try 1 day without success to create regexp working for exclude my config.ini.php.
Original work regexp for all file following this pattern: index.html, test.php, foo.bar
(.+.(?!php).*)
I've try (.+.(?!ini\.php).*) but for an unknow reason i dont understand when i add dot in negative lookahead my group stop working, because i need a matching for config.ini.php.
Thank you in advance for your help really needed :)
Have a good dev
William