Javascript 正则表达式匹配大括号
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5437694/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Regex matching curly bracket
提问by gnome
Looking for help in matching the curly brackets in a regular expression pattern. I've tried different combinations of escapes, and symbol matching with little luck. Perhaps because it's Friday afternoon and I'm overlooking something; but your ideas would be greatly appreciated. The code below:
寻求在正则表达式模式中匹配大括号的帮助。我尝试了不同的转义组合和符号匹配，但运气不佳。也许是因为现在是星期五下午，我在俯视一些东西；但您的想法将不胜感激。下面的代码：
function stringFormat(str, arr) {
for (var i = 0; i < arr.length; i++) {
var regExp = new RegExp('^\{' + i + '\}$', 'g');
str = str.replace(regExp, arr[i]);
}
return str;
}
var str = '<p>The quick {0}, brown {1}</p>';
$('#test').html(stringFormat(str, ['brown', 'fox']));
I've also started a fiddle on this, http://jsfiddle.net/rgy3y/1/
我也开始了这个问题，http://jsfiddle.net/rgy3y/1/
回答by Mike Samuel
Instead of trying to match a bunch of different numbers, why not just do it all in one fell swoop:
与其尝试匹配一堆不同的数字，不如一举完成所有这些：
function stringFormat(str, arr) {
return str.replace(
/\{([0-9]+)\}/g,
function (_, index) { return arr[index]; });
}
On your example,
在你的例子中，
var str = '<p>The quick {0}, brown {1}</p>';
// Alerts <p>The quick brown, brown fox</p>
alert(stringFormat(str, ['brown', 'fox']));
This has the benefit that nothing weird will happen if arrcontains a string like '{1}'. E.g.stringFormat('{0}', ['{1}', 'foo']) === '{1}'consistently instead of 'foo'as with the fixed version of the original, but inconsistently with stringFormat('{1}', ['foo', '{0}']) === '{0}'
这样做的好处是，如果arr包含像“{1}”这样的字符串，则不会发生任何奇怪的事情。例如，与原始版本的固定版本stringFormat('{0}', ['{1}', 'foo']) === '{1}'一致而不是一致'foo'，但与stringFormat('{1}', ['foo', '{0}']) === '{0}'
回答by Laurence Gonsalves
To get a \in a string literal you need to type \\. In particular, '\{'== '{'. You want '\\{'.
要\在字符串文字中获取 a ，您需要输入\\. 特别是'\{'== '{'。你要'\\{'。
回答by unexpectedvalue
Not familiar with javascript (or whatever) regex, but you are only matching expressions that contain only {X} (or only lines with that expression, again depending on your regex).
'^{' + i + '}$'
不熟悉 javascript（或其他）正则表达式，但您只匹配仅包含 { X} 的表达式（或仅包含该表达式的行，再次取决于您的正则表达式）。
' ^{' + i + '} $'
Remove the ^ and $.
删除 ^ 和 $。
