Javascript正则表达式可查找输入中除浮点数以外的任何字符

Question

The user can provide any kind of data. I need to make sure the input string contains only floating point number. So I need to make sure the data contains only numbers or a dot (.) and return false if the input data has anything other than numbers or a dot. Can someone help me with the javascript regular expression? I tried searching a lot. But I could not find any help for my specific case.

So this should return characters for cases like
12.09a23
aa12.12
abcd

Update

I donot want to see if the input string has floating point number. I want to see if the input has anything other than floating point number. For example, if the input has 12.3aa23, I want to show the input has aa so this is an invalid input.

Answer 1

function isDigit(str){
var n = str.search(/^(\d)*(\.)*(\d)*$/); 
return (n!==-1);
}

from here and here :-)

jsfiddle

Answer 2

You can use /^[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?$/ regex to find floating point numbers in individual strings (thus, adding anchors). Source

Also, here is a demo .

Snippet:

 if ("12.09a23".search(/^[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?$/) != -1) { alert("Floating number detected! ") } else { alert("Floating number not detected! Invalid data inside string: " + "12.09a23".replace(/[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?/g, '')) }