Question

我想将整个文本字符串转换为大写，但在有角度的括号内写入的文本除外。

我还想删除趋势支架。

我制作了以下代码，但反之亦然：

    $text='this PART should be CONVERTED to uppercase [This PART should not BE changed] this part should also be CONVERTED to uppercase [THIS part should also not be CHANGED] etc..';      

    $text = preg_replace_callback(
        "(\[(.*?)\])is",
        function($m) {

            return strtoupper($m[1]);
        },
        $text);
    echo $text;

Answer 1

您可以使用PCRE动词SKIP和FAIL跳过这些匹配。您可以在此处详细了解这些内容，http://www.rexegg.com/regex-best-trick.html。

$text='this PART should be CONVERTED to uppercase [This PART should not BE changed] this part should also be CONVERTED to uppercase [THIS part should also not be CHANGED] etc..';      
$text = preg_replace_callback(
        "/\[(.*?)\](*SKIP)(*FAIL)|\w+/is",
        function($m) {
            return strtoupper($m[0]);
        },
        $text);
echo $text;

正则表达式演示：https://regex101.com/r/nwG2wW/4/
PHP演示：https://3v4l.org/rkFUGd

Answer 2

[^][]++(?=\[|$)

Match a single character not present in the list below [^][]++
++ Quantifier — Matches between one and unlimited times, as many times as possible, without giving back (possessive)
][ matches a single character in the list ][ (case sensitive)
Positive Lookahead (?=\[|$)
Assert that the Regex below matches
1st Alternative \[
\[ matches the character [ literally (case sensitive)
2nd Alternative $
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)

与preg_replace_callback进行相反的匹配

2 个答案: