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正则表达式以特定数字开头

GG网络技术分享 2025-03-18 16:15 0

How to write regular expression for following conditions:

So for I can do only for first two conditions. I am not sure how to do the third conditions

My code is

 if (!preg_match(\'/^[0-9]{8}$/\', $number))

You\'re almost there. Simply remove the first number from the character class and validate it at the start of your pattern...

/^(8|9|6)\\d{7}$/

FYI - \\d is the escape sequence for digits. I suppose you could also use this

/^[896]\\d{7}$/

as it means about the same thing when you\'re only watching for a single character at the start.

正则表达式 - 简介

除非您以前使用过正则表达式，否则您可能不熟悉一些术语。但是，毫无疑问，您已经使用过不涉及脚本的某些正则表达式概念。

例如，您很可能使用 ? 和 * 通配符来查找硬盘上的文件。? 通配符匹配文件名中的 0 个或 1 个字符，而 * 通配符匹配零个或多个字符。像 data(\\w)?\\.dat 这样的模式将查找下列文件：

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