const regex = new RegExp('(\\d+\\.([1-9]{3}|[1-9]{2}|[1-9]|0{1}))(\\d*)', 'gm')
const str = `#提取有效小数的思路：匹配出符合要求的组合不符合要求的组。
#使用sub函数，re.sub(pat,lambda m:m[1],s)
#repl使用函数，传递的参数是pat,所匹配的match对象，提取match对象中符合要求的组即可。
124.1230000012
124.1200003412
123.0000000012
1.2000
`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions