How to remove parentheses in PHP regular

• PHP Remove the curly braces and the contents inside the curly braces

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$str= 'dfsas{kslajfljs}45'; $str= preg_replace( '/\{(.*?)\}/', '',$str); echo$str;

• PHP Remove parentheses and contents in parentheses

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$str= '9(kslajflj)s45'; $str= preg_replace('/\(.*?\)/', '', $str); echo$str;exit;

• PHP Remove the angle brackets and the contents inside the angle brackets

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$str= '9sfa<kslj>s45'; $str= preg_replace('/\<.*?\>/', '', $str); echo$str;exit;

• PHP Remove the brackets and the contents inside the brackets

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$str= '9sfa[ksl64546+j]s45'; $str= preg_replace('/\[.*?\]/', '', $str); echo$str;exit;