正则表达式允许在前两个字母后使用空格而不是后面的数字

Question

我需要一个允许AB123有一个空格的正则表达式，即不允许使用AB123但应该允许使用AB 123 ？

Answer 1

This pattern will do the work: ^[a-zA-Z]{2} \\d+$

Explanation:

^ - match beginning of a string

[a-zA-Z]{2} - match two letters (upper- or lowercase),

- match space

\\d+ - match one or more digits

$ - match end of a string

Demo

Answer 2

Here is the regex [a-zA-Z]{2}\\s\\S*

[a-zA-Z] means character from a to Z

{2} means character twice

\\s means white space

\\S means non white space.

* duplicate with 0 or more

https://regex101.com/r/uWYci4/1