[0-99] to match numbers of up to two digits, when in fact it is equivalent to [0-9].
Another common cause is forgetting to escape the - character, creating an unintended range that overlaps with other characters in the
character class.
-+Character ranges can also create duplicates when used with character class escapes. These are a type of escape sequence used in regular expressions +to represent a specific set of characters. They are denoted by a backslash followed by a specific letter, such as
+\dfor digits, +\wfor word characters, or\sfor whitespace characters. For example, the character class escape\dis +equivalent to the character range[0-9], and the escape\wis equivalent to[a-zA-Z0-9_].How to fix it
+Remove the extra character, character range, or character class escape.
+Code examples
+Noncompliant code example
+/[0-99]/ // Noncompliant, this won't actually match strings with two digits /[0-9.-_]/ // Noncompliant, .-_ is a range that already contains 0-9 (as well as various other characters such as capital letters) +/[a-z0-9\d]/ // Noncompliant, \d matches a digit and is equivalent to [0-9]-Compliant solution
-+Compliant solution
+/[0-9]{1,2}/ /[0-9.\-_]/ +/[a-z\d]/+Resources
+Documentation
+