You attempted to create a regular expression with an invalid character set range. Character sets must range from single characters only, such as a-z or 0-9; you cannot include character classes such as \w in a character set. The first character in the range must also come before the second character in the range. For example:
var good = /[a-z]/; // A valid character range - a comes before z. var notGood = /[z-a]/; // An invalid character range - z does not come before a.
To correct this error
- Use only single characters to compose your regular expression character set, and make sure they are in the correct order.