如何找到字符串某个部分开始的位置？

Question

It's late, I'm really tired, I'm having a lot of trouble figuring out a simple thing.

I have a string which will be of the form

BROADCAST FROM x\ny\nz

...where x is a single word with no spaces or newlines, y is a number, and z is a string whose length in characters is y .

All I need is to find the starting index of z so that I may take string.slice(indexOfZ) instead .

What is the form of this regular expression, and how would I write it in JavaScript?

It should be to the effect of...

pattern = /\n[0-9]{1,}\n.*/;
var index = string.match(pattern);

Am I wrong somewhere?

Answer 1

为什么/^BROADCAST FROM \\w+ \\d+ (.+)$/不起作用？

Answer 2

Regexes are good and all, but in this instance why make it hard for yourself.

var aParts = sFullString.split("\n");

Edit : Looks like u just want z so :

var z = aParts[2];

Answer 3

one way to find this is split the string by /

var myString = x\ny\nz;
var str =  myString.split('\'); //if the format is same.

var index = str[2].indexOf("z") .

There may be another solution. but this is one that currently comes in my mind.

Hope this one helps.