数字后跟单词的正则表达式 [英] Regex for a number followed by a word

问题描述

在 JavaScript 中，数字后跟单词的正则表达式是什么?我需要捕捉数字和单词并在计算后替换它们.

In JavaScript, what would be the regular expression for a number followed by a word? I need to catch the number AND the word and replace them both after some calculation.

以下是示例形式的条件:

Here are the conditions in a form of example:

123 dollars => Catch the '123' and the 'dollars'.
foo bar 0.2 dollars => 0.2 and dollars
foo bar.5 dollar => 5 and dollar (notice the dot before 5)
foo bar.5.6 dollar => 5.6 and dollar
foo bar.5.6.7 dollar => skip (could be only 0 or 1 dot)
foo bar5 dollar => skip
foo bar 5dollar => 5 and dollar
5dollar => 5 and dollar
foo bar5dollar => skip

• 当然，123.555、0.365、5454.1 也是数字.

• 为了使事情更简单，这个词是一个特定的词(例如美元|欧元|日元).

  • Of course 123.555, 0.365, 5454.1 are numbers too.

  • For making things simpler the word is a specific one (e.g dollar|euro|yen).

    好的..谢谢大家...这是我目前所做的基本功能:

    OK.. Thank you all... Here is the basic function I made so far:

    var text = "foo bar 15 美元.bla bla..";var 货币 = {美元:0.795};

    var text = "foo bar 15 dollars. bla bla.."; var currencies = { dollars: 0.795 };

    document.write(text.replace(/\b((?:\d+.)?\d+) *([a-zA-Z]+)/, function(a,b,c){返回货币[c] ?b * 货币[c] + '欧元' : a;}));

    document.write(text.replace(/\b((?:\d+.)?\d+) *([a-zA-Z]+)/, function(a,b,c){ return currencies[c] ? b * currencies[c] + ' euros' : a; } ));

    推荐答案

    试试这个:

    /\b(\d*\.?\d+) *([a-zA-Z]+)/
    

    这也将匹配 .5 测试 之类的东西.如果你不想这样，使用这个:

    That will also match stuff like .5 tests. If you don't want that, use this:

    /\b((?:\d+\.)?\d+) *([a-zA-Z]+)/
    

    并避免匹配5.5.5美元":

    And to avoid matching "5.5.5 dollars":

    /(?:[^\d]\.| |^)((?:\d+\.)?\d+) *([a-zA-Z]+)/
    

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