[英]Regex - match character only once - then ignore
I went through a lot of questions and couldn't solve my problem. 我遇到了很多问题,无法解决我的问题。
I need to match a number of special characters, but only once. 我需要匹配多个特殊字符,但只能匹配一次。
HTML: HTML:
<form class="FillIn Rearrange">
<input data-correctanswer="ça" type="text">,
<input data-correctanswer="ça" type="text">
<input data-correctanswer="vé" type="text">
<input data-correctanswer="bién" type="text">
</form>
This JS currently returns ALL ç, and é, but I need 1 max. 该JS当前返回ALLç和é,但我最多需要1个。 of each: 每个:
var buttons = '';
$('.FillIn input').each(function () {
var corrAns = $(this).attr('data-correctanswer');
for (var i = 0; i < corrAns.length; i++) {
if (corrAns[i].match(/[éç]/g)) {
buttons += '<button>' + corrAns[i] + '</button>';
}
}
});
Currently returns ççéé (all occurrences) 当前返回ççéé(所有情况)
Need it to return çé (one of each). 需要它返回çé(每个)。
Need a scalable solution, ie .match(/[éçdfga]/g) (or any extra letter) 需要一个可扩展的解决方案,即.match(/ [éçdfga] / g)(或任何其他字母)
It looks like you want to end the for loop as soon as you get a match, so throw in a break statement: 看起来您想在获得匹配项后立即结束for循环,因此请输入break语句:
var buttons = '';
$('.FillIn input').each(function () {
var corrAns = $(this).attr('data-correctanswer');
for (var i = 0; i < corrAns.length; i++) {
if (corrAns[i].match(/[éç]/g)) {
buttons += '<button>' + corrAns[i] + '</button>';
break;
}
}
});
You simply need to remember what you have already found and not process it: 您只需要记住已经找到的内容而不进行处理:
var buttons = '';
var found = []; // this remembers what we have already found
$('.FillIn input').each(function () {
var corrAns = $(this).attr('data-correctanswer');
for (var i = 0; i < corrAns.length; i++) {
var m; // hold the match
if (m = corrAns[i].match(/[éç]/)) {
// not found yet
if(found.indexOf(m[0]) == -1) {
found.push(m[0]) // remember it's been found
buttons += '<button>' + corrAns[i] + '</button>';
}
}
}
});
Here's how you can do it: 您可以按照以下方法进行操作:
var buttons = ''; function createButtons(lettersToMatch){ $('.FillIn input').each(function () { var corrAns = $(this).attr('data-correctanswer'); for (var i = 0; i < corrAns.length; i++) { var match = corrAns[i].match(new RegExp(lettersToMatch)); if (match) { buttons += '<button>' + corrAns[i] + '</button>'; lettersToMatch = lettersToMatch.replace(match[0], ""); } } }); } //Testing createButtons("[éèçêïë]"); $("body").append( buttons );
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <form class="FillIn Rearrange"> <input data-correctanswer="çaï" type="text">, <input data-correctanswer="ça" type="text"> <input data-correctanswer="vé" type="text"> <input data-correctanswer="bién" type="text"> </form>
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