将电子邮件地址中的用户名部分替换为星号 [英] Replace username part in email addresses into asterisks

问题描述

如何将电子邮件地址中的用户名转换为星号.用户名中的第一个和最后一个字母保持原样，其余字母替换为 (*).

How can I convert username in email addresses into asterisks. The first and last letter in the username stay as it is and rest replaced with (*).

示例:

[e-mail]

进入

m****[e-mail]

推荐答案

您可以使用环顾四周来完成.

You can do it using look arounds.

/(?!^).(?=[^@]+@)/

• (?!^) 消极的看后面.检查字符前面是否没有字符串开头.这可确保未选择第一个字符.

  • (?!^) Negative look behind. Checks if the character is not preceded by start of string. This ensures that the first character is not selected.

    . 匹配单个字符.

    (?=[^@]+@) 积极展望.确保匹配的单个字符后跟除 @(由 [^@] 确保)和 @

    (?=[^@]+@) Positive look ahead. Ensures that the single character matched is followed by anything other than @ ( ensured by [^@] ) and then a @

    正则表达式演示

    示例

    preg_replace("/(?!^).(?=[^@]+@)/", "*", "[e-mail]")
    =>  m****[e-mail]
    

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