How to remove bracket content in php regular expression

How to remove the contents of brackets in php regular rules: 1. Use "preg_replace( '/\{(.*?)\}/', '',$str);" to remove the curly braces and the contents inside the curly braces Content; 2. Remove through "preg_replace('/\(.*?\)/', '', $str);", etc.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

A brief discussion of PHP regular rules for removing brackets and brackets Content

• PHP removes the content inside curly braces and braces

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

• PHP removes the content inside braces and braces
  

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

• PHP removes angle brackets and the content inside the angle brackets

$str = &#39;9sfa<kslj>s45&#39;;
$str = preg_replace(&#39;/\<.*?\>/&#39;, &#39;&#39;, $str);
echo $str;exit;

• PHP removes the brackets and the content inside the brackets

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

Note: Mainly look at the regular expression, and change it flexibly according to the expression

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