Use of JS Regular expressions

The characters commonly used character of the regular expression:

Symbol	Describe
/.. /	Represents the beginning and end of a pattern
^	Match the start of a string
$	Match the end of a string
\s	Any whitespace character
\s	Any non-whitespace character
\d	Matches a numeric character, equivalent to [1-9]
\d	Any character other than a number, equivalent to [^0-9]
\w	Match a number, underscore, or alphabetic character, equivalent to [a-za-z0-9]
\w	Any non-single character, equivalent to [^a-za-z0-9]
.	Any character other than line breaks

Repeating characters for regular expressions

Symbol	Describe
N	Matches the previous n times
{N,}	Matches the previous item n times, or multiple times
{N,m}	Match the previous item at least n times, but not more than m times
*	Matches the previous item 0 or more times, equivalent to {0,}
+	Matches the previous item 1 or more times, equivalent to {1,}
?	Matches the previous item 0 or 1 times, which means the previous item is optional, equivalent to {0,1}

Use of JS Regular expressions