如何使用正则表达式和JavaScript将1 1/2重新格式化为相当一部分HTML

Question

I have a string like 5 1/36 that I want to rewrite as 5 <sup>1</sup>&frasl;<sub>36</sub> . Before the fraction, there can either be nothing or a space, and after the fraction there can either be a space or nothing. A string could contain multiple fractions. The fractions may be positive or negative.

example:

myString = '(1 3/4)÷(-2/3)-(-6)-(6)-(1)+(-4)';

Answer 1

Like this:

var regex = /(\d+)\/(\d+)/g;
var myString = "(1 3/4)÷(-2/3)-(-6)-(6)-(1)+(-4)";
var myResult = myString.replace(regex, "<sup>$1</sup>&frasl;<sub>$2</sub>");
// "(1 <sup>3</sup>&frasl;<sub>4</sub>)÷(-<sup>2</sup>&frasl;<sub>3</sub>)-(-6)-(6)-(1)+(-4)"

Answer 2

一个简单的字符串替换数字有关/应该可以解决问题

str = str.replace(/\b(\d+)\/(\d+)/g, '<sup>$1</sup>&frasl;<sub>$2</sub>');

Answer 3

Here's a working example:

 myString = '(1 3/4)÷(-2/3)-(-6)-(6)-(1)+(-4)'; document.write(myString.replace(/(\\d+)(\\/)(\\d+)/g, '<sup>$1</sup>&frasl;<sub>$3</sub>'))