Why is 'B' matched by [a-z]?
javascript, regex
Solution
Yes, but you have the `i` parameter which tells the regex to ignore case.
From the MDN documentation for RegEx:
Parameters
pattern
The text of the regular expression.
flags
If specified, flags can have any combination of the following values:
...
`i`
ignore case
Problem
a very simple & naive question: why this is true? ``` new RegExp('^[a-z]+$', 'i').test('B') ``` apparently 'B' is out of [a-z]?