正则表达式 - preg_match_all 减少数组结果

Question

这是我的注册表达式“[c]?[\d+|\D+]\s*”。我的输入是 "c7=c4/c5*100"，结果是：

Array
(
    [0] => Array
        (
            [0] => c7
            [1] => =
            [2] => c5
            [3] => +
            [4] => c3
            [5] => *
            [6] => 1
            [7] => 0
            [8] => 0
        )
)

但我想要的是：

Array
(
    [0] => Array
        (
            [0] => c7
            [1] => =
            [2] => c5
            [3] => +
            [4] => c3
            [5] => *
            [6] => 100
        )

)

我似乎无法完成最后一部分工作，我不知道下一步该怎么做 - 有人能帮忙吗？

谢谢，保罗

Answer 1

您指定了一个 character class [\d+|\D+] which would match any of the specified characters. I think you meant using an or | with a grouping 构造 c?(?:\d+|\D+)\s* 但在那种情况下它将匹配 c 后跟 \d+ 或 \D 以便匹配 = 在它之后签名，导致 c= 作为匹配项，/c 作为匹配项。

尝试匹配可选的 c c? 后跟一位或多位数字或 | 不匹配数字 \D

c?\d+|\D

$re = '/c?\d+|\D/m';
$str = 'c7=c4/c5*100';
preg_match_all($re, $str, $matches);
print_r($matches);

这将导致：

Array
(
    [0] => Array
        (
            [0] => c7
            [1] => =
            [2] => c4
            [3] => /
            [4] => c5
            [5] => *
            [6] => 100
        )

)

Demo

正则表达式 - preg_match_all 减少数组结果

Reg Exp - preg_match_all reduce array result

php

regex

preg-match-all