php 如何匹配正则表达式中的两个单词之一？
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How do you match one of two words in a regular expression?
提问by Adrian Sarli
I want to match either @ or 'at' in a regex. Can someone help? I tried using the ? operator, giving me /@?(at)?/ but that didn't work
我想在正则表达式中匹配 @ 或 'at'。有人可以帮忙吗？我尝试使用 ? 运营商，给我 /@?(at)?/ 但这没有用
回答by Michael Myers
Try:
尝试：
/(@|at)/
This means either @or atbut not both. It's also captured in a group, so you can later access the exact match through a backreference if you want to.
这意味着要么@或at但不是两者兼而有之。它还在一个组中捕获，因此您可以稍后通过反向引用访问完全匹配项（如果需要）。
回答by chaos
/(?:@|at)/
mmyers' answer will perform a paren capture; mine won't. Which you should use depends on whether you want the paren capture.
mmyers 的回答将执行括号捕获；我的不会。您应该使用哪个取决于您是否想要括号捕获。
回答by ghostdog74
if that's only 2 things you want to capture, no need regex
如果这只是您想要捕获的两件事，则不需要正则表达式
if ( strpos($string,"@")!==FALSE || strpos($string,"at") !==FALSE ) {
# do your thing
}
回答by Josh E
have you tried
你有没有尝试过
@|at
that works for (in the .NET regex flavor) the following text
适用于（在 .NET regex 风格中）以下文本
[email protected] johnsmithatgmail.com
[email protected] johnsmithatgmail.com
回答by Erick Asto Oblitas
What about:
关于什么：
^(\w*(@|at))
For:
为了：
- johnsmith@gmail.com
- johnsmithatgmail.com
- jonsmith@atgmail.com
- 约翰史密斯@gmail.com
- johnsmithatgmail.com
- jonsmith @atgmail.com
