Hi can any one explain me this regex: /^a-z$/i. I have some questions: Why \d\d is not same as \d*. If i took [a-z] after | the solution is still correct. Why? Why \d\d refers to last two digits why not first 2 digits or in between?
Welcome, ayaz.
Here is a tool I have found to be extremely helpful, when it comes to regex: regex101
To answer some of your questions:
/^a-z$/i
This matches a
at the start of the string, followed by -
, ending with z
. Case insensitive.
\d\d
matches two digits next to each other.
\d*
matches zero or more digits next to each other.
I do not understand what you mean by the next question…|
is the or
operator.
If you have a global identifier g
, then \d\d
matches every case of two digits next to each other. If you do not have the global identifier, then \d\d
will only match the first two digits.
I hope this helps.
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