正则表达式在飞镖中的双数 [英] Regex for double numbers in dart

问题描述

从我之前的问题开始，我试图只允许将双精度格式的数字输入到TextField中.我浏览了整个万维网，却没有找到用于飞镖的正则表达式.

As from my previous question I'm trying to allow only numbers in double format into a TextField. I have looked through the whole wide web and didn't find a Regex for dart.

TextFormField(
        inputFormatters: [
          WhitelistingTextInputFormatter(RegExp(r'\d*\.?\d+')) //<-- useless attempt to allow double digits only
        ])

推荐答案

您可以尝试:

WhitelistingTextInputFormatter(RegExp(r'(^\d*\.?\d*)'))

以下是此正则表达式的更严格版本.如果用户按除所需格式以外的任何无效字符，则该字段将被清除.

And the following is a stricter version of this regex. If the user press any invalid character other than the desired format the field will get cleared.

WhitelistingTextInputFormatter(RegExp(r'(^\d*\.?\d*)$'))

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