Question

目前，我的应用程序像这样保存锻炼日志。

Start time: 8:49:41 PM                                                     Objective: 17 pushups a minute for 1 hour                                                                      Total: 1020 pushups                                                     59 minutes have gone by                                                     0 pushups remaining                                                     0 minutes remaining                                                     Times Paused: 0                                                     Finished at: 9:49:41 PM

我正在尝试通过使用...来删除大量空白和新行。

string.trim().replace(/[\s]/g," ").toString()

目标是保存文件，并用新行删除大量空白，以便像这样易于阅读...

Start time: 8:49:41 PM
Objective: 17 pushups a minute for 1 hour
Total: 1020 pushups
59 minutes have gone by
0 pushups remaining
0 minutes remaining
Times Paused: 0
Finished at: 9:49:41 PM

所以我的问题很简单。

如何用换行符删除大量空白？

var string = output.textContent.toString();

console.log(string.trim().replace(/[\s]/g," ").toString())

<div id="output">
                <h1>
                  Start time: 8:49:41 PM
                </h1>
                <h1>
                  Objective: 17 pushups a minute for 1 hour
                </h1><br>
                
                <h1>
                  Total: 1020 pushups
                </h1>
                <h1>
                  59 minutes have gone by
                </h1>
                <h1>
                  pushups remaining
                </h1>
                <h1>
                  0 minutes remaining
                </h1>
                <h1>
                  Times Paused: 0
                </h1>
                <h1>
                  Finished at: 9:49:41 PM
                </h1>
              </div>

问题已解决，感谢Emma's的出色帮助...

string.trim().replace(/\s{2,}/gm,"\n").toString()

Answer 1

也许\s{2,}可以工作，否则，您可以尝试将\s{3,}或\s{4,}换成新行：

const regex = /\s{2,}/gm;
const str = `Start time: 8:49:41 PM                                                     Objective: 17 pushups a minute for 1 hour                                                                      Total: 1020 pushups                                                     59 minutes have gone by                                                     0 pushups remaining                                                     0 minutes remaining                                                     Times Paused: 0                                                     Finished at: 9:49:41 PM
`;
const subst = `\n`;

// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);

console.log(result);

如果您想探索/简化/修改表达式，可以在右上角的面板上进行了说明 regex101.com。如果您愿意，也可以在this link中观看它的匹配方式针对一些样本输入。

Answer 2

没有疯狂的正则表达式。拆分，贴图，修剪和过滤器

var string = output.textContent.split(/\n+/).map(s => s.trim()).filter(s => s).join("\n")
console.log(string)

<div id="output">
                <h1>
                  Start time: 8:49:41 PM
                </h1>
                <h1>
                  Objective: 17 pushups a minute for 1 hour
                </h1><br>
                
                <h1>
                  Total: 1020 pushups
                </h1>
                <h1>
                  59 minutes have gone by
                </h1>
                <h1>
                  pushups remaining
                </h1>
                <h1>
                  0 minutes remaining
                </h1>
                <h1>
                  Times Paused: 0
                </h1>
                <h1>
                  Finished at: 9:49:41 PM
                </h1>
              </div>

reg exp

var string = output.textContent.trim().replace(/\s*\n\s*/g, '\n').replace(/\n+/,'\n')
console.log(string)

<div id="output">
                <h1>
                  Start time: 8:49:41 PM
                </h1>
                <h1>
                  Objective: 17 pushups a minute for 1 hour
                </h1><br>
                
                <h1>
                  Total: 1020 pushups
                </h1>
                <h1>
                  59 minutes have gone by
                </h1>
                <h1>
                  pushups remaining
                </h1>
                <h1>
                  0 minutes remaining
                </h1>
                <h1>
                  Times Paused: 0
                </h1>
                <h1>
                  Finished at: 9:49:41 PM
                </h1>
              </div>

用新行删除大量空白

2 个答案: