时则取消正则表达式匹配"/>
如果超时则取消正则表达式匹配
如果需要超过 10 秒才能完成,是否可以取消
regex.match
操作?
我正在使用一个巨大的正则表达式来匹配特定的文本,有时可能有效,有时可能会失败...
正则表达式:
MINISTÉRIO(?:[^P]*(?:P(?!ÁG\s:\s\d+\/\d+)[^P]*)(?:[\s\S]*?))PÁG\s:\s+\d+\/(\d+)\b(?:\D*(?:(?!\1\/\1)\d\D*)*)\1\/\1(?:[^Z]*(?:Z(?!6:\s\d+)[^Z]*)(?:[\s\S]*?))Z6:\s+\d+
工作示例:
所以..如果超过 10 秒我想取消操作。是否可以?我在 sof
中找不到任何相关内容谢谢。
回答如下:您可以生成一个执行正则表达式匹配的子进程,如果它在 10 秒内未完成则将其关闭。可能有点矫枉过正,但它应该有效。
fork 可能是你应该使用的,如果你走这条路。
如果你能原谅我的非纯函数,这段代码将演示如何在分叉子进程和主进程之间来回通信的要点:
index.js
const { fork } = require('child_process');
const processPath = __dirname + '/regex-process.js';
const regexProcess = fork(processPath);
let received = null;
regexProcess.on('message', function(data) {
console.log('received message from child:', data);
clearTimeout(timeout);
received = data;
regexProcess.kill(); // or however you want to end it. just as an example.
// you have access to the regex data here.
// send to a callback, or resolve a promise with the value,
// so the original calling code can access it as well.
});
const timeoutInMs = 10000;
let timeout = setTimeout(() => {
if (!received) {
console.error('regexProcess is still running!');
regexProcess.kill(); // or however you want to shut it down.
}
}, timeoutInMs);
regexProcess.send('message to match against');
regex-process.js
function respond(data) {
process.send(data);
}
function handleMessage(data) {
console.log('handing message:', data);
// run your regex calculations in here
// then respond with the data when it's done.
// the following is just to emulate
// a synchronous computational delay
for (let i = 0; i < 500000000; i++) {
// spin!
}
respond('return regex process data in here');
}
process.on('message', handleMessage);
不过,这可能最终掩盖了真正的问题。您可能需要考虑像其他海报所建议的那样重新设计您的正则表达式。
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如果超时则取消正则表达式匹配
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