Example a1234567, a12345678, a123456789 are valid entries. 方法一：使用删除键直接删除 这是最简单直接的方法，适用于office和wps大多数情况： 1.将光标定位在最后一页的开头处。 2.按住键盘上的 delete 键或 backspace 键，直到空白页消失且光标移动到前一. I have a string which contains ssid and password, but the wifi.begin() function accepts only const char*, and i don't know how to convert.
Currently trying to validate a 9 digit number that a user may input in several different ways.
What is a suitable regular expression to validate that a string matches the format a123456 first letter must be a letter upper case or lower case then exactly 6 numeric numbers following it. The number may or may not begin with a capital a, which is then proceeded by the 9 numbers or just 9 numbers.
