如何-仅在空格之前选择第一个破折号？
HEllo Good - That is my - first world
我写的正则表达式.+?(?=-)选择了HEllo Good - That is my.
如果我只有 string HEllo Good - That is my，它看起来不错，但是有空格。
var string = 'HEllo Good - That is my - first world';
console.log(string.match(/.+?(?=-)/gm));如果您只需要第一个破折号，只需使用输入的开头匹配字符串^：
const text = 'HEllo Good - That is my - first world';
const pattern = /^.*?\s(-)/;
const match = text.match(pattern);
console.log(`full match: ${match[0]}`);
console.log(`dash only: ${match[1]}`)如果您需要之前的内容，包括/排除第一个破折号：
const text = 'HEllo Good - That is my - first world';
const patternIncludeDash = /(^.*?\s-)/;
const patternExcludeDash = /(^.*?\s)-/;
console.log('before the dash, but include dash: ' + text.match(patternIncludeDash)[1]);
console.log('before the dash, but exclude dash: ' + text.match(patternExcludeDash)[1]);本文收集自互联网，转载请注明来源。
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我来说两句