[英]Remove several dots/commas in string from every decimal number
How can I check for a comma in a number?如何检查数字中的逗号?
Lets assume I have a string which represents a polynomial term that looks like this让我们假设我有一个字符串,它代表一个看起来像这样的多项式项
string x = "x+1+5,54";
Now the user wants to put in and add a comma which will then be "x1+5,54," which is not a number anymore.现在用户想要输入并添加一个逗号,然后将是“x1+5,54”,这不再是一个数字了。 How can I check this with an if?
我怎样才能用if来检查这个?
Something like if the last number already contains a comma don't append another one.如果最后一个数字已经包含逗号,则不要 append 另一个数字。
Use regular expression.使用正则表达式。
if (Regex.IsMatch(a, @"^((\d+,?\d*)|(\w?))([-+/]((\d+,?\d*)|(\w?)))*$"))
{
//correct
}
else
{
//incorrect
}
You'll get false, when user inputs extra comma, so you can handle it.当用户输入额外的逗号时,您会得到错误,因此您可以处理它。
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