Question

我正在尝试使用正则表达式来定位时间并向其添加文本。但是当输入字符串有换行符时，我的正则表达式有问题。如果我删除了中断并测试表达式，它就可以工作。

此外，在找到目标时间后，如何在其前后添加文字？

var str = "00:00:01.120
In this lesson, we will learn how to determine the equation of a line, using the available information.

00:00:08.040
Let's look at the first example. Determine the equation of the line, that passes through the points (2, 5), and with the slope of 2. 

00:00:19.000
To begin, we should know that the equation of a line can be written in the form of y = mx + b, where m is the slope, and b is the y-intercept.";


    var patt1 = /(\d\d.\d\d.\d\d.\d\d\d)/gm;
    var result = str.match(patt1);

Answer 1

正如其他人所说，您需要先修复多行字符串。

完成此操作后，您可以使用replace方法而不是match方法在匹配时间之前和之后添加文字：

var str = "00:00:01.120\n\
In this lesson, we will learn how to determine the equation of a line, using the available information.\n\
\n\
00:00:08.040\n\
Let's look at the first example. Determine the equation of the line, that passes through the points (2, 5), and\ with the slope of 2.\n\
\n\
00:00:19.000\n\
To begin, we should know that the equation of a line can be written in the form of y = mx + b, where m is the\ slope, and b is the y-intercept.";


var patt1 = /(\d\d.\d\d.\d\d.\d\d\d)/gm;
//var result = str.match(patt1);
var result = str.replace(patt1, "<some text>\$1<some other text>");
alert(result);

您可以在fiddle中尝试此操作。

有关replace方法的详细信息，请查看MDN's reference page。

Answer 2

为str分配值的方式不正确。您的浏览器必须已阻止您的脚本，因此从未进行过解析。

您可以使用\ r \ n替换换行符，如下所示，

var str = "00:00:01.120\r\nIn this lesson, we will learn how to determine the equation of a line, using the available information.\r\n00:00:08.040\r\nLet's look at the first example. Determine the equation of the line, that passes through the points (2, 5), and with the slope of 2.\r\n00:00:19.000\r\nTo begin, we should know that the equation of a line can be written in the form of y = mx + b, where m is the slope, and b is the y-intercept.";

您可以查看此fiddle以查看其工作原理。

多行正则表达式无法正常工作

2 个答案: