i want to restrict multiple negative symbols in numeric using regex in typescript. im getting error SyntaxError: Invalid regular expression

Issue

How to restrict multiple negative sign in the textbox. below code is not allowing my to type even single negative symbol.

my regex code -

public AmountFormat ="^(\\+?\\-? *[0-9]+)([,0-9]*)([0-9])*$";

error -

not allowing to enter (-) symbol if i write regex in the variable.

public AmountFormat ="((^|, )(-|-?[0-9]\d*(\.\d+)?))+$"; //not working

 return /((^|, )(-|-?[0-9]\d*(\.\d+)?))+$/.test(input);//working

Solution

try

public AmountFormat =/^-?\d*(\d\.\d*)?$/;

details:

const isValid = (input) => {
  const AmountFormat = /^-?\d*(\d\.\d*)?$/;
  return AmountFormat.test(input);
}


console.warn(isValid('100'));

// true


console.warn(isValid('-100.0'));

// true


console.warn(isValid('--100'));

// false

console.warn(isValid('-'));

// true

Answered By - Jafar Jabr