/ ^ (18 [0-9] {9}) | (15 [0-9] {9}) $/ Why the rule matches 1844444444444444 . My understanding of this rule is starting with 18 or 15 followed by 9 digits 0-9 .
Note: I know there are other ways to write the rules of mobile phone numbers. I just want to understand why this one matches.
/^(18[0-9]{9})|(15[0-9]{9})$/this expression is equivalent to:
/(^18[0-9]{9})|(15[0-9]{9}$)/is because the priority ratio of ^ and $is higher than |, so ^ matches 18 [0-9] {9} first
/^(18[0-9]{9})$|^(15[0-9]{9})$/ because the previous 11 bits have been matched successfully
your expression cannot match
^(18[0-9]{9})|(15[0-9]{9})$your way of writing is equivalent to
^(18[0-9]{9})or
(15[0-9]{9})$
, that is, the priority question, you need to add parentheses as follows:
^((18[0-9]{9})|(15[0-9]{9}))$in fact, this js library already has API for verifying mobile phone numbers. Please refer to bee.js
./ ^ (18 [0-9] {9}) | (15 [0-9] {9}) $/
first of all, you need to understand what the rule you are writing means:
^ (18 [0-9] {9}) or (15 [0-9] {9}) $matches
translates as:
(beginning with 18 and 9 decimal numbers) or (15 and 9 decimal endings) match
then the data you give goes like this:
1844444444444444444444
since it is an or statement, it matches the beginning of 18 and 9 decimal numbers, so it naturally matches
.can be changed to this / ^ (18 [0-9] {9}) $| ^ (15 [0-9] {9}) $/ match your desired mobile phone
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