regex - PHP Regular Expression pattern accepts characters that are not allowed - 


preg_match('~^[a-za-z0-9!@#$%^*()-_+=.]+$~', $string)

this pattern used in code, wanted telling users they're allowed use these characters. problem works characters , not others. example doesn't allow string "john&john" allows "test<>" though didn't enter '<' , '>' in pattern!

i test regexps tools https://regex101.com/

you must escape special characters in regexp:

^[a-za-z0-9!@#\$%\^\*\(\)\-_\+=\.]+$

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