I want an input text box that restricts users to only enter numbers and one decimal point.
The regular expression I am using currently is /[^\d.]/g.
Currently this allows the user to only input numbers and decimals but also allows for more than one decimal number. I am using it for a text box to allow only a string of numbers along with one decimal following another string of numbers but ends.
Text box code:
onkeyup= "this.value=this.value.replace(/[^\d.]/g, '' )".
Full html block:Enter your second number <input type="text" id="num2" onClick="(this.value='')" onkeyup= "this.value=this.value.replace(/[^\d.]/g, '' )" />
I have this expression here that highlights what I'm looking for /^\d+(\.\d+)?/gm it's just I need it completely in-versed.
/^\d+(\.\d+)?/gm
/\d+(\.\d+)/gm
/(^\d+[.]\d+)+[\d]+/gm
The preceding expressions allow input for everything but numbers and decimals. I need to allow only numbers and decimals for input.
I have seen others but none seem to accomplish exactly what I am looking for. I don't not want to allow negative numbers either but would like it optional.
Any guidance would be appreciated. Thanks for the help.
I think the expression you are looking for is /^\d+(\.)?\d+/gm
You can view it with the test cases you provided on regex101, here
EDIT: As @Konrad Linkowski pointed out this does not work for single digits such as
1. The updated regex(^\.*)+(^0*)+^\d+(\.\d+)?includes this edge case.
Try this:
/^\d+(\.\d+)?$/
Should work for any positive decimal number.