Regular and common formulas

Regular basic symbols

^： Start symbol ,^x Said to x start 
$： End symbol ,x$ Said to x ending 
[n-m]： From n To m The number of 
\d： Representation number , Equate to [0-9]
X{m}： By m individual X Character formation 

Id card

18 Composition of ID card ： Six digit birth area code + Eight digit date of birth code + Three digit sequence code + One digit check code

isIDCard=/^[1-9]\d{
    5}[1-9]\d{
    3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{
    4}$/;

[1-9]\d{5}： Six digit birth area code , The birth area code does not begin with 0 start , So the first is [1-9].
[1-9]\d{3}： Four digit year of eight digit date of birth code , The same year does not begin with 0 start .
((0\d)|(1[0-2]))： Two digit month of eight digit date of birth code ,| Express or , The form of month is 0\d Or is it 10、11、12.
(([0|1|2]\d)|3[0-1])： Two digit date of eight digit date of birth code , Date by 01 to 31.
\d{4}： Three digit sequence code + One digit check code , There are four .

15 Composition of ID card ： Six digit birth area code + Six digit birth date code + Three digit sequence code

isIDCard=/^[1-9]\d{
    7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{
    3}$/;

[1-9]\d{7}： Six digit birth area code + Year of two digit date of birth code , The year here refers to the last two , Therefore, no first place cannot be 0 The limitation of , So the merger .
The following is related to 18 Bit similar .