javascript 匹配句子中的精确字符串
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match exact string in a sentence
提问by dazzle
How to exactly match a given string in a sentence.
如何精确匹配句子中的给定字符串。
For example if the sentence is var sentence = "A Google wave is basically a document which captures a communication"
例如，如果句子是 var sentence = "Google wave 基本上是一个捕获通信的文档"
and the given string is var inputString= "Google Wave". I need to check the exact presence of Google Wave in the above sentence & return true or false.
并且给定的字符串是 var inputString="Google Wave"。我需要在上面的句子中检查 Google Wave 的确切存在并返回 true 或 false。
I tried
我试过
if(sentence.match(inputString)==null){
alert("No such word combination found.");
return false;
}
This works even if someone enters "Google W". I need a way to find the exact match. Please help
即使有人输入“Google W”，这也有效。我需要一种方法来找到完全匹配的内容。请帮忙
回答by Thomas Li
OP wants to return false when do search with Google W.
OP 想在使用Google W.
I think you should use word boundary for regular expression.
我认为您应该将字边界用于正则表达式。
http://www.regular-expressions.info/wordboundaries.html
http://www.regular-expressions.info/wordboundaries.html
Sample:
样本：
inputString = "\b" + inputString.replace(" ", "\b \b") + "\b";
if(sentence.toLowerCase().match(inputString.toLowerCase())==null){
alert("No such word combination found.");
}
回答by Brad Christie
Using javascript's String.indexOf().
使用 javascript 的String.indexOf().
var str = "A Google wave is basically a document which captures a communication";
if (str.indexOf("Google Wave") !== -1){
// found it
}
For your case-insensitive comparison, and to make it easier:
对于不区分大小写的比较，并使其更容易：
// makes any string have the function ".contains([search term[, make it insensitive]])"
// usage:
// var str = "Hello, world!";
// str.contains("hello") // false, it's case sensitive
// str.contains("hello",true) // true, the "True" parameter makes it ignore case
String.prototype.contains = function(needle, insensitive){
insensitive = insensitive || false;
return (!insensitive ?
this.indexOf(needle) !== -1 :
this.toLowerCase().indexOf(needle.toLowerCase()) !== -1
);
}
Oop, wrong doc reference. Was referencing array.indexOf
哎呀，错误的文档参考。正在引用 array.indexOf
回答by dazzle
ContainsExactString2 was just me going more in-depth than necessary, '===' should work just fine
ContainsExactString2 只是我比必要的更深入，“===”应该可以正常工作
<input id="execute" type="button" value="Execute" />
// Contains Exact String
$(function() {
var s = "HeyBro how are you doing today";
var a = "Hey";
var b = "HeyBro";
$('#execute').bind('click', function(undefined) {
ContainsExactString(s, a);
ContainsExactString(s, b);
});
});
function ContainsExactString2(sentence, compare) {
var words = sentence.split(" ");
for (var i = 0; i < words.length; ++i) {
var word = words[i];
var pos = 0;
for (var j = 0; j < word.length; ++j) {
if (word[j] !== compare[pos]) {
console.log("breaking");
break;
}
if ((j + 1) >= word.length) {
alert("Word was found!!!");
return;
}++pos;
}
}
alert("Word was not found");
}
function ContainsExactString(sentence, compare) {
var words = sentence.split(" ");
for (var i = 0; i < words.length; ++i) {
if(words[i] === compare) {
alert("found " + compare);
break;
}
}
alert("Could not find the word");
break;
}
