代码之家 › 专栏 › 技术社区 › ZachTurn

在多行上捕获相同的正则表达式

pcre regex

ZachTurn · 技术社区 · 8 年前

# Input
# data/raw/file1
# data/raw/file2

# Output
# data/interim/file1
# data/interim/file2

当前尝试

# Input\n(# (.*))

我的内部捕获组正确捕获 data/raw/file1

期望输出

我想要的是抓取中间的所有文件 # Input # Output ,所以在这个例子中, 数据/原始/文件1 data/raw/file2

2 回复 | 直到 8 年前

Community Mohan Dere 6 年前

配合 \G 魔术:

(?:^#\s+Input|\G(?!\A))\R*(?!#\s+Output)#\s*(.*)|[\s\S]*

Live demo

正则表达式分解

(?:                 # Start of non-capturing group (a)
    ^#\s+Input          # Match a line beginning with `# Input`
    |                   # Or
    \G(?!\A)            # Continue from previous successful match point
)                   # End of NCG (a)
\R*                 # Match any kind of newline characters
(?!#\s+Output)      # Which are not followed by such a line `# Output`
#\s*(.*)            # Start matching a path line and capture path
|                   # If previous patterns didn't match....
[\s\S]*             # Then match everything else up to end to not involve engine a lot

PHP代码:

$re = '~(?:^#\s+Input|\G(?!\A))\R*(?!#\s+Output)#\s*(.*)|[\s\S]*~m';
$str = '# Input
# data/raw/file1
# data/raw/file2

# Output
# data/interim/file1
# data/interim/file2';

preg_match_all($re, $str, $matches, PREG_PATTERN_ORDER, 0);

// Print the entire match result
print_r(array_filter($matches[1]));

输出:

Array
(
    [0] => data/raw/file1
    [1] => data/raw/file2
)

chris85 Ferenc Kurucz 8 年前

使用 s 修饰符, preg_match preg_split 你可以自己得到每个结果。

preg_match('/# Input\n(# (?:.*?))# Output/s', '# Input
# data/raw/file1
# data/raw/file2

# Output
# data/interim/file1
# data/interim/file2', $match);
$matched = preg_split('/# /', $match[1], -1, PREG_SPLIT_NO_EMPTY);
print_r($matched);

演示: https://3v4l.org/dAcRp

https://regex101.com/r/5tfJGM/1/