The code is the first four digits of every cell phone number. No matter where you are, you cannot call a cell phone number without this code.
这个代码就是手机号的前四位,不管从哪个地方打电话,都不能少了这4位。
If a match is made, the first three digits are captured in the first set of parentheses, the next three digits in the second set; and the final four digits in the remaining operator.
如果找到匹配,则把前三个数字捕捉到第一组括号中,把接下来的三个数字捕捉到第二组括号中;并且把最后四个数字捕捉到剩余操作符中。
Seven lowercase and alphanumeric characters, first three characters being alphabetic and the last four characters being digits.
七个小写字母和字母数字字符,前三个字符为字母,而后四个字符为数字。
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