[英]how to check if text exists in javascript var
I have a var that contains some text. 我有一个包含一些文本的var。 I would like to check whether the texts has a certain word.
我想检查文本是否有某个词。
Example: 例:
var myString = 'This is some random text';
I would like to check if the word "random" exists. 我想检查“随机”这个词是否存在。 Thanks for any help.
谢谢你的帮助。
If you want to test for the word "random" specifically, you can use a regular expression like this: 如果你想专门测试“随机”这个词,你可以使用这样的正则表达式:
Example: http://jsfiddle.net/JMjpY/ 示例: http : //jsfiddle.net/JMjpY/
var myString = 'This is some random text';
var word = 'random';
var regex = new RegExp( '\\b' + word + '\\b' );
var result = regex.test( myString );
This way it won't match where "random" is part of a word like "randomize". 这样它就不会匹配“随机”是像“随机化”这样的单词的一部分。
And of course prototype it onto String if you wish: 如果您愿意,当然可以将其原型化为String:
Example: http://jsfiddle.net/JMjpY/1/ 示例: http : //jsfiddle.net/JMjpY/1/
String.prototype.containsWord = function( word ) {
var regex = new RegExp( '\\b' + word + '\\b' );
return regex.test( this );
};
myString.containsWord( "random" );
You can do it with a standalone function: 您可以使用独立功能执行此操作:
function contains(str, text) {
return str.indexOf(text) >= 0);
}
if(contains(myString, 'random')) {
//myString contains "random"
}
Or with a prototype extension: 或者使用原型扩展:
String.prototype.contains = String.prototype.contains || function(str) {
return this.indexOf(str) >= 0;
}
if(myString.contains('random')) {
//myString contains "random"
}
With respect to Jacob, There is a missing Opening Bracket in the 'contains' function. 关于Jacob,'contains'功能中缺少Opening Bracket。
return str.indexOf(text) >= 0);
should be 应该
return (str.indexOf(text) >= 0);
I have opted for Patricks Answer and adapted it into a function 我选择了Patricks Answer并将其改编成一个函数
function InString(myString,word)
{
var regex = new RegExp( '\\b' + word + '\\b' );
var result = regex.test( myString );
return( result );
}
Call the Function with 用函数调用函数
var ManyWords='This is a list of words';
var OneWord='word';
if (InString(ManyWords,OneWord)){alert(OneWord+' Already exists!');return;}
This would return False because although 'words' exists in the variable ManyWords, this function shows only an exact match for 'word'. 这将返回False,因为尽管变量ManyWords中存在“单词”,但此函数仅显示“单词”的完全匹配。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.