如何在javascript中使用正则表达式选择不在双/单引号之间的数字

Question

hi i have problem selecting the numbers that is not in the single/double qoutes . let say we have this text below .

    <style color='#424242'></style>

123

    /* you can count this 5454 */

    <style color="#767676"></style>

8787

i want to select just the 123 and 8787 , nothing else how should i do this with regular expression in javascript

if i use \\d in RegExp it w'll select all the numbers and i know that . but i want to tell it that only select those numbers that is not surrounded by double/single/star .

Answer 1

I would do that :

var numbers = str.split('"').filter(function(_,i){ return !(i%2) }).join('')
                 .split("'").filter(function(_,i){ return !(i%2) }).join('')
                 .match(/\d+/g);

The idea is to start by removing what is between quotes and then applying a regular expression.

Demonstration (open the console)

But, like any time HTML and regexes are mixed, you'll find cases where it doesn't work. So, if your use case isn't strictly controlled, you'd better parse, for example by applying a regex to element.texContent||element.innerText .

Answer 2

This is probably not very cross-browser solution:

var iterator = document.evaluate(
    "descendant::text()",
    document.body, null,
    XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null),
node;
while (node = iterator.iterateNext()) {
    (node.nodeValue.match(/\d+/) || []).forEach(console.log);
}

Tested only in Firefox, but AFAIK, most browsers provide some XPath API, just look into the relevant documentation.