Javascript jQuery 在变量中搜索文本？
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jQuery Search for Text in a Variable?
提问by thatryan
I have a variable that contains some text, some html, basically can be a string. I need to search the variable for a specific string to process that variable differently if it is contained. Here is a snippet of what I am trying to do, does not work obviously :)
我有一个包含一些文本、一些 html 的变量，基本上可以是一个字符串。我需要在变量中搜索特定字符串，以便在包含该变量时以不同方式处理该变量。这是我正在尝试做的一个片段，显然不起作用:)
$.each(data.results,
function(i, results) {
var text = this.text
var pattern = new RegExp("^[SEARCHTERM]$");
if(pattern.test( text ) )
alert(text); //was hoping this would alert the SEARCHTERM if found...
回答by user113716
You could use .indexOf()instead to perform the search.
您可以.indexOf()改为使用来执行搜索。
If the string is not found, it returns -1. If it is found, it returns the first zero-based indexwhere it was located.
如果未找到该字符串，则返回-1。如果找到，则返回其所在位置的第一个从零开始的索引。
var text = this.text;
var term = "SEARCHTERM";
if( text.indexOf( term ) != -1 )
alert(term);
If you were hoping for an exact match, which your use of ^and $seems to imply, you could just do an ===comparison.
如果您希望精确匹配，您的使用^和$似乎暗示了这一点，您可以进行===比较。
var text = this.text;
var term = "SEARCHTERM";
if( text === term )
alert(term);
EDIT:Based on your comment, you want an exact match, but ===isn't working, while indexOf()is. This is sometimes the case if there's some whitespace that needs to be trimmed.
编辑：根据您的评论，您想要完全匹配，但===不起作用，indexOf()而是。如果有一些空白需要修剪，有时就会出现这种情况。
Try trimming the whitespace using jQuery's jQuery.trim()method.
尝试使用jQuery 的jQuery.trim()方法修剪空格。
var text = $.trim( this.text );
var term = "SEARCHTERM";
if( text === term )
alert(term);
If this doesn't work, I'd recommend logging this.textto the console to see if it is the value you expect.
如果这不起作用，我建议登录this.text到控制台以查看它是否是您期望的值。
回答by PleaseStand
If you are using a regular expression to search for a substring, you can find the match like this:
如果您使用正则表达式来搜索子字符串，您可以像这样找到匹配项：
var match = text.match(pattern);
if(match) {
alert(match[0]);
}
See the documentation for .match()for more information.
有关.match()更多信息，请参阅文档。
Note that if you are trying to search for the string "[SEARCHTERM]"(a search term containing brackets), your search method will not work because the brackets have a special meaning within regular expressions. Instead, use .indexOf():
请注意，如果您尝试搜索字符串"[SEARCHTERM]"（包含括号的搜索词），您的搜索方法将不起作用，因为括号在正则表达式中具有特殊含义。相反，使用.indexOf()：
var index = text.indexOf("[SEARCHTERM]");
if(index != -1) {
alert("Search term found");
}
However, if you are just trying to find an exact match (nothing else but the search term is in the string you are checking), you should just compare the strings:
但是，如果您只是想找到一个完全匹配的（除了搜索词在您检查的字符串中），您应该只比较字符串：
if(text == "[SEARCHTERM]") {
alert("Search term found");
}
回答by Lightness Races in Orbit
What does "does not work" mean here?
这里的“不起作用”是什么意思？
Be aware that you should use braces ({}) with ifstatements. Some browsers will allow you to miss them out but you should include them to be correct and to support everything.
请注意，您应该{}在if语句中使用大括号 ( ) 。有些浏览器会让您错过它们，但您应该将它们包含在内以确保正确并支持所有内容。
