如何使用正则表达式 String.match() 区分 ${SOME_TEXT} [英] How to String.match() distinct it ${SOME_TEXT} using Regex

问题描述

我需要这个字符串:

var x = 'Hi ${name}! How are you? ${name}, you are old! ${name} share with ${other} how do u ${feel}!'

我需要使用正则表达式知道存在多少不同的 ${ANY_THING}.在上面的例子中，我期望 3: ${name}, ${other}, ${feel}

I need to know using Regex how much distinct ${ANY_THING} exists. In example above i expect 3: ${name}, ${other}, ${feel}

我正在尝试:

x.match(\${([a-zA-Z]))

但是输出是错误的:(

谢谢！

推荐答案

我在 #regex IRC Channel 找到了这个解决方案，由 farn 用户提供:

I find this solution at #regex IRC Channel by farn user:

x.match(/\$\{([^\}]+)\}(?![\S\s]*\$\{\1\})/g);

输出:

['${name}',
 '${other}',
 '${feel}']

和

x.match(/\$\{([^\}]+)\}(?![\S\s]*\$\{\1\})/g).length;

输出:

3

:)

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