Parentheses, (), groups elements together,
allowing us to check multiple characters.
This code defines a regular expression
pattern regexGrouping which matches any
single character in a string.
console.log(regexGrouping.test("abab"))
returns true because the string abab
contains multiple single characters,
each of which matches the pattern.
Similarly, console.log(regexGrouping.test("ab"))
returns true because the string ab contains two single characters, each of which matches the pattern.