regex get string between two characters code example

Example 1: get everything between two characters regex

(?<=\[)(.*?)(?=\])

Example 2: regex get text between braces

$text = 'ignore everything except this {{ text1  }}';
preg_match('#\{\{(.*?)\}\}#', $text, $match);
var_dump($match);

Example 3: regex match two characters

echo %H#E%L#L%O! | sed 's/[#%]//g'	#replaces every appearance of any of
two characters # and %