如何检查值是否为数字? [英] How can I check if a value is a number?

问题描述

我只想检查表单文本字段的返回值是否为数字，即: 12 、 12.5 或 12.75 .有没有一种简单的方法来检查这一点，尤其是当值被拉为 param 时?

I want to simply check if a returned value from a form text field is a number i.e.: 12 , 12.5 or 12.75. Is there a simple way to check this, especially if the value is pulled as a param?

推荐答案

只需正则表达式即可，这很琐碎，除此之外不值得考虑:

Just regexp it, it's trivial, and not worth thinking about beyond that:

v =~ /\A[-+]?[0-9]*\.?[0-9]+\Z/

(根据贾斯汀的评论修正)

(Fixed as per Justin's comment)

这篇关于如何检查值是否为数字?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！