^ Indicates that the string must start with the character after the ^, when used in a bracket expression, it indicates that the character is not accepted in the bracket expression.

$ Indicates that the string must end with the character before the $.

Use wildcards and special escape characters to match more characters

• . matches any character except for newline characters
• \w matches a word character (alphanumeric character or underscore)
• \W matches any character that is not a word character (not alphanumeric or underscore)
• \b matches the position at the start or end of a word
• \B matches any position that is not at the start or end of a word
• \d matches a digit
• \D matches any character that is not a digit
• \s matches any whitespace character
• \S matches any character that is not a whitespace character
• \n matches a newline character

• * Matches the preceding subexpression zero or more times
• + Matches one or more times
• ? Matches zero or one time
• {n} Repeats n times
• {n,} Repeats n times or more
• {n,m} Repeats from n to m times

Use () to capture groups, () will return the full match plus the group, unless you use the g flag, use the pipe operator | inside () to specify what the group should match, equivalent to or.

Character groups help match specific characters or specific character sequences. They can represent a large batch of characters like character shortcuts, such as \d matching the same characters as [0-9]. Negating a character group will match characters that do not match the character group. For example, if you don't want to match digits, you can write: [^0-9]

To match special characters, use the backslash

The special characters in JavaScript regular expressions are: ^ $ \。 * +？ () [] {} |

So, to match an asterisk, you can use \*, not just *