为什么正则表达式补集字符类(^)无法捕获全部匹配结果？

问题原因 #

你写的正则出错的核心原因是[^(Æ¢)]的用法错误：方括号[]内的字符集只会匹配单个字符，你写的[^(Æ¢)]实际含义是「匹配所有不等于(、Æ、¢、)的单个字符」，而第二个示例的内容里包含括号(，匹配到括号时就直接中断了，所以只能拿到第一个结果。

修复方案 #

要实现匹配{Æ¢到Æ¢}之间的所有内容，改用惰性匹配逻辑即可，正则修改如下：

// 加s标志让.可以匹配换行符，适配内容中存在换行的场景
const regex = /{Æ¢\s*(.*?)\s*Æ¢}/gs;

如果需要直接提取去了前后空格的大括号内的内容，可以用matchAll遍历结果提取分组内容：

let str = `First example (working): {Æ¢ Example phrase 123 áè -*, example Æ¢}
           Second example (not working): {Ƣ A SuperSlim notebook computer that's light on weight, heavy on features and performance *This .9 thin Notebook Computer weighs in at roughly 3 pounds - which might make you wonder how they cram such great features into that small package *10.4 XGA Active matrix screen with XBRITE display technology *Intel Pentium 300 MHz processor with MMX technology *64 MB of SDRAM is included (expandable to 128 MB maximum) *6.4 GB fixed Hard Drive for Data Storage *Touch Pad with pen operation *One Type II PC card slot with Cardbus Zoomed Video support *External 1.44 MB floppy disk drive *integrated 56K V.90 Data/fax Modem for Internet access *512 KB MultiBank DRAM Cache memory *16-bit, Soundblaster compatible audio *MPEG1 Digital video that supports full screen playback *mono speakers *Built-in microphone *Infrared port *Responsive nearly full-size tactile Keyboard *programmable power key for unattended Email retrieval Please add $30 for shipping. Payment - western union. Ƣ}`

const result = [...str.matchAll(/{Æ¢\s*(.*?)\s*Æ¢}/gs)].map(item => item[1]);
console.log(result);

运行后会输出两个你需要的内容：

[
  'Example phrase 123 áè -*, example',
  "A SuperSlim notebook computer that's light on weight, heavy on features and performance *This .9 thin Notebook Computer weighs in at roughly 3 pounds - which might make you wonder how they cram such great features into that small package *10.4 XGA Active matrix screen with XBRITE display technology *Intel Pentium 300 MHz processor with MMX technology *64 MB of SDRAM is included (expandable to 128 MB maximum) *6.4 GB fixed Hard Drive for Data Storage *Touch Pad with pen operation *One Type II PC card slot with Cardbus Zoomed Video support *External 1.44 MB floppy disk drive *integrated 56K V.90 Data/fax Modem for Internet access *512 KB MultiBank DRAM Cache memory *16-bit, Soundblaster compatible audio *MPEG1 Digital video that supports full screen playback *mono speakers *Built-in microphone *Infrared port *Responsive nearly full-size tactile Keyboard *programmable power key for unattended Email retrieval Please add $30 for shipping. Payment - western union."
]

如果需要保留外层的大括号和首尾的Æ¢，直接用修改后的正则调用match即可：

console.log(str.match(/{Æ¢\s*.*?\s*Æ¢}/gs));

内容的提问来源于stack exchange，提问作者FCLM