正则表达式 - PHP Lookaround

发布于 2024-08-24 11:13:52 字数 240 浏览 3 评论 0原文

我有一个字符串，例如：

$foo = 'Hello __("How are you") I am __("very good thank you")'

我知道这是一个奇怪的字符串，但请留在我身边 :P

我需要一个正则表达式来查找 __("Look for content here") 之间的内容并将其放入数组中。

即正则表达式会找到“你好吗”和“非常好，谢谢”。

原文

I have a string, such as this:

$foo = 'Hello __("How are you") I am __("very good thank you")'

I know it's a strange string, but stay with me please :P

I need a regex expression that will look for the content between __("Look for content here")
and put it in an array.

i.e. the regular expression would find "How are you" and "very good thank you".

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感情废物 2024-08-31 11:13:52

试试这个：

preg_match_all('/(?<=__\(").*?(?="\))/s', $foo, $matches);
print_r($matches);

这意味着：

(?<=     # start positive look behind
  __\("  #   match the characters '__("'
)        # end positive look behind
.*?      # match any character and repeat it zero or more times, reluctantly
(?=      # start positive look ahead
  "\)    #   match the characters '")'
)        # end positive look ahead

编辑

正如格雷格提到的：对于不太熟悉环视的人来说，将它们排除在外可能会更具可读性。然后匹配所有内容：__(", the string and ") 并包装与 string 匹配的正则表达式, .*?，位于括号内以仅捕获这些字符。然后，您需要通过 $matches[1] 获取匹配项。演示：

preg_match_all('/__\("(.*?)"\)/', $foo, $matches);
print_r($matches[1]);

Try this:

preg_match_all('/(?<=__\(").*?(?="\))/s', $foo, $matches);
print_r($matches);

which means:

(?<=     # start positive look behind
  __\("  #   match the characters '__("'
)        # end positive look behind
.*?      # match any character and repeat it zero or more times, reluctantly
(?=      # start positive look ahead
  "\)    #   match the characters '")'
)        # end positive look ahead

EDIT

And as Greg mentioned: someone not too familiar with look-arounds, it might be more readable to leave them out. You then match everything: __(", the string and ") and wrap the regex that matches the string, .*?, inside parenthesis to capture only those characters. You will then need to get your matches though $matches[1]. A demo:

preg_match_all('/__\("(.*?)"\)/', $foo, $matches);
print_r($matches[1]);

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赏烟花じ飞满天 2024-08-31 11:13:52

如果您想使用 Gumbo 的建议，则应归功于他的模式：

$foo = 'Hello __("How are you")I am __("very good thank you")';

preg_match_all('/__\("([^"]*)"\)/', $foo, $matches);

请确保对结果使用 $matches[1] ，除非您也想要完整的字符串结果。

$matches 的 var_dump()：

array
  0 => 
    array
      0 => string '__("How are you")' (length=16)
      1 => string '__("very good thank you")' (length=25)
  1 => 
    array
      0 => string 'How are you' (length=10)
      1 => string 'very good thank you' (length=19)

If you want to use Gumbo's suggestion, credit goes to him for the pattern:

$foo = 'Hello __("How are you")I am __("very good thank you")';

preg_match_all('/__\("([^"]*)"\)/', $foo, $matches);

Make sure to use $matches[1] for your results unless you want the full string results too.

var_dump() of $matches:

array
  0 => 
    array
      0 => string '__("How are you")' (length=16)
      1 => string '__("very good thank you")' (length=25)
  1 => 
    array
      0 => string 'How are you' (length=10)
      1 => string 'very good thank you' (length=19)

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