替换 PCRE (Perl) 语法中两个字符串之间的字符

Question

如何替换两个特殊字符串之间的特殊字符。

我有这样的东西：

"start 1
2-
G
23
end"

我想要以下内容：

"start 1 2- G 23 end"

只在"start and end"

之间用space替换\n

Test1;Hello;"Text with more words";123
Test2;want;"start 
1-
76 end";123
Test3;Test;"It's a test";123
Test4;Hellp;"start
1234
good-
the end";1234
Test5;Test;"It's a test";123

记事本++可以吗？

Answer 1

魔法词是惰性量词、先行和单行模式。
PHP（使用 PCRE）的解决方案是：

<?php 
$string = __your_string_here__;

$regex = '~(?s)(?:start)(?<content>.*?)(?=end)(?s-)~';
# ~ delimiter
# (?s) starts single line mode - aka dot matches everything
# (?:start) captures start literally
# .*? matches everything lazily
# (?=end) positive lookahead
# (?s-) turn single line mode off
# ~ delimiter
preg_match_all($regex, $string, $matches);
$content = str_replace("\n", '', $matches["content"][1]);
echo $content; // 1234good-the 

?>

Answer 2

您可以使用这种模式：

(?:\G(?!\A)|\bstart\b)(?:(?!\bend\b).)*\K\R

demo

详情：

(?:
    \G(?!\A)       # contiguous to a previous match
  |
    \bstart\b      # this is the first branch that matches
)
(?:(?!\bend\b).)*  # zero or more chars that are not a newline nor the start of the word "end"
\K                 # remove all on the left from the match result
\R                 # any newline sequence (\n or \r\n or \r)

注意：(?:(?!\bend\b).)* 不是很有效，请随意用更适合您的特定情况的东西替换它。

替换 PCRE (Perl) 语法中两个字符串之间的字符

Replace character between two string in PCRE (Perl) syntax

regex

pcre

replace