Which function in PHP is used to perform a regular expression match?

Which regular expression modifier in PHP performs a case-insensitive match?

Which function in PHP is used to perform a regular expression replace?

Which function in PHP is used to match multiple occurrences of a pattern in a string using regular expressions?

Which function in PHP is used to extract matches from a string using regular expressions?

Which regular expression modifier in PHP matches any character except a newline character?

Which regular expression metacharacter in PHP matches any non-digit character?

Which regular expression metacharacter in PHP matches any whitespace character?

Which function in PHP is used to replace all occurrences of a pattern in a string using regular expressions?

Which function in PHP is used to check if a string matches a regular expression pattern?