no-empty-character-class
NOTE: this rule is part of the
recommended rule set.Enable full set in
deno.json:{
"lint": {
"tags": ["recommended"]
}
}Enable full set using the Deno CLI:
deno lint --tags=recommended
Disallows using the empty character class in a regular expression.
Regular expression character classes are a series of characters in brackets,
e.g. [abc]. if nothing is supplied in the brackets it will not match anything
which is likely a typo or mistake.
Invalid:
/^abc[]/.test("abcdefg"); // false, as `d` does not match an empty character class
"abcdefg".match(/^abc[]/); // null
Valid:
// Without a character class
/^abc/.test("abcdefg"); // true
"abcdefg".match(/^abc/); // ["abc"]
// With a valid character class
/^abc[a-z]/.test("abcdefg"); // true
"abcdefg".match(/^abc[a-z]/); // ["abcd"]