使用for循环和打印匹配来自两个变量的字符串 [英] Matching a string from two variables using for loop and print

问题描述

var userSearch="guy";
var text="Andriken is nice guy";
var hits=[];

for(var i = 0; i< text.length; i++){
   if(text[i] === "guy"){
           hits.push(userSearch);

}}
if(hits.length === 0){
    console.log("Not found");
}
else{
    console.log(hits);
}

我的尝试：



工作如果text [i] ===单个字母（例如g）试图找到并推送字符串！

What I have tried:

working if text[i] === single letter (eg. "g" ) trying to find and push string !

推荐答案

听起来像你需要使用正则表达式。

正则表达式 - JavaScript | MDN [ ^ ]

Sounds like you need to use regular expressions.
Regular Expressions - JavaScript | MDN[^]

var userSearch = /guy/g;
var text = "Andriken is nice guy";
var hits = text.match(userSearch);

if (hits.length === 0) {
    console.log("Not found");
}
else {
    console.log(hits);
}

如果 userSearch 是由...提供的字符串用户，你需要逃避任何特殊字符。借用此StackOverflow答案中的escapeRegExp函数[ ^ ]：

If the userSearch is a string provided by the user, you'll need to "escape" any special characters. Borrowing the "escapeRegExp" function from this StackOverflow answer[^]:

function escapeRegExp(str) {
  return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\

\ |] / g， \\

\|]/g, "\\

&）;
}

var userSearchString = >人吗？;
var userSearchPattern = escapeRegExp（userSearchString）;
var userSearch = new RegExp （userSearchPattern， g）;

var text = 安德里肯是个好人？;
var hits = text.match（userSearch）;
...

&"); } var userSearchString = "guy?"; var userSearchPattern = escapeRegExp(userSearchString); var userSearch = new RegExp(userSearchPattern, "g"); var text = "Andriken is nice guy?"; var hits = text.match(userSearch); ...

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