php - RegExp - How to return a single row of answers instead of multiple rows of answers

Question

I have a RegExp

/h.*e.*l.*l.*o.*/i

And I have my paragraph that its being run on.

Hey look at that lion!

The result is this:

answer[0] = Hey look at that lion!
answer[1] = H
answer[2] = e
answer[3] = l
answer[4] = l
answer[5] = o

I was wondering if I could get a result like this:

answer[0] = Hey look at that lion!
answer[1] = Hello

by only changing my RegExp. Maybe using grouping or something? And if the answer to that question is no, then what are my other options? I really don't want to loop over the answer and string it together either, but if that's the only way then I will do it like that I suppose.

Answer 1

你的表情很好。您只需执行一次并返回一个匹配项。没关系。

在这里查看参考：http ://regex101.com/r/jU3zU2

如果您愿意，您可以像我在示例中那样使用反向引用来获取整个数据。

但是，您想返回“你好”，这就是您在正则表达式中所拥有的......所以呃..什么？

Answer 2

使用正则表达式是不可能的。使用正则表达式时不可更改的规则之一是每个字符只能匹配一次。这意味着您不能返回整个句子和其中的某些部分。

例子：

"abc".match(/a|b|c|(abc)/g)

最后一abc组，虽然它会匹配，但永远不会匹配，因为 abc 的字符匹配前面的表达式a|b|c

我不知道你想通过在正则表达式中对结果进行硬编码来实现什么，我假设你的真实代码应该做其他事情。如果没有，只需将“hello”分配给一个变量。

Answer 3

array_shift($answer);
$answer = implode('',$answer);

array_shift 将从结果数组中删除包含整个字符串的元素，然后 implode 会将它们全部组合成一个字符串。