The perfect 18-digit ID number for regular expressions

Match the 18-bit ID number and the regular expression is as follows:

/^[1-9][0-9]{5} (19|20) [0-9]{2} ((01|03|05|07|08|10|12) (0[1-9]|[ 1-2][0-9]|31) | (04|06|09|11) (0[1-9]| [1-2] [0-9]|30] |02 (0[1-9]|[ 1-2][0-9])) [0-9]{3} ([0-9]|x| X) $/

Note: Now the ID number is already 18, there is no need to consider matching 15 bit.

18-digit ID Number: 6-digit area + 4-year + 4-month-day + 3-digit + 1-bit new generation number

Logic:

1) 6-digit area number: First non-0, after five digits. corresponding regular: [1-9][0-9]{5}

2) 4-digit year: 19 or 20 starts with the post two digits. Corresponding Regular: (19|20) [0-9]{2}

3) 4-Month Day:

i) Otsuki 31 days. Corresponding Regular: (01|03|05|07|08|10|12) (0[1-9]|[ 1-2][0-9]|31)

II) Xiao Yue for 30 days. Corresponding Regular: (04|06|09|11) (0[1-9]|[ 1-2][0-9]|30)

III) February 28 days or 29 days. corresponding Regular: 02 (0[1-9]|[ 1-2][0-9])

4) 3-digit number: three-digit number. corresponding regular: [0-9]{3}

5) 1-bit new generation number: number or X. corresponding Regular: ([0-9]|x| X

The perfect regular still has its drawbacks:

1) Unmatched leap year

2) does not match the presence of the first three-digit region number

The perfect 18-digit ID number for regular expressions