php中字符串的正则表达式，以逗号查找单词

Question

我正在尝试为php写一个Regexp来扫描真实文件，关键字是require ，而我想要的字符串在方括号"my string" （需要保留）中

FILE1.TXT

require "testing/this/out.js"
require "de/test/as.pen"
require "my_love.test"

.....

print "I require coffee in the morning" //problem

• 需求将在页面顶部。
• 遵循标准require "_String_"格式

---

FILE2.TXT

Class Ben extends Name

....

print "My good boss always extends my deadline" //problem

• 扩展名只能跟随类名
• 只有一个字，只有一个结果

---

// looping true and determining if class or if reg file by folder structure
$subject = "Code above";
$pattern = '/^require+""/i'; // Not sure of the correct pattern
preg_match($pattern, $subject, $matches);
print_r($matches);

我只想testing this out然后de/test/as.pen返回第一个示例的数组。

这可能吗？ 会有很多问题吗？

Answer 1

您可以使用此正则表达式：

$pattern = '/^ *require +"([^"]+)"/i';

Answer 2

^require (['"])([.\w /]+)\1

匹配结果：

preg_match('#^require (['"])([.\w /]+)\1#', $code, $match);

说明 ：

^               #  Start of string
require         #  reserved word with an space after
(['"])          #  Quotations
(               #  Capturing group
    [.\w /]+    #   Any possible characters
)               #  End of capturing group
\1              #  Same quotation

演示

Answer 3

这个想法是跳过引号内的内容：

$pattern = <<<'LOD'
~
(["']) (?> [^"'\\]++ | \\{2} | \\. | (?!\1)["'] )* \1 # content inside quotes
(*SKIP)(*FAIL)  # forces this possibility to fail
|
(?>^|\s)
require \s+ " ([^"]++) "
~xs
LOD;

preg_match_all($pattern, $subject, $matches, PREG_SET_ORDER);
print_r($matches);