How can I block the user input entering commas in case of negative decimals with regex in typescript angular 2?

I have a component directive shared for all fields, but I want to add a rule for a field specific, this field block user input commas, I have the following code in file ts but it only satisfies the condition for positive decimals (ex: 2323.34343) else case negative decimals (ex: -3232.323) I can't enter a minus sign because of the regex check function not match with the first character being the minus sign.
How can I fix it? pls help me, thanks a lot!!!!

  private el: HTMLInputElement;

  private check(value: string) {
            const regExpString = "^-?\\s*((\\d+(\\.\\d{0,5})?)|((\\d*(\\.\\d{1,5}))))\\s*$";
            return String(value).match(new RegExp(regExpString));
    }

    @HostListener("keydown", ["$event"])
    onKeyDown(v) {
            const value: string = this.el.value;
            const next: string = value.concat(v.key); 
            console.log(this.check(next))
            if (next && !this.check(next)) { 
                v.preventDefault();
            }
    }```





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# 答案1
**得分**: 1

通过HTML文件 - 使用“pattern”在HTML文件中应用数字或字母的验证。

通过TS文件 - 使用逗号验证的ASCII值。如果用户输入逗号，则将匹配逗号的ASCII代码。使用if else。

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<summary>英文:</summary>

Through HTML file - Apply validations for numbers or alphabets in html file using &quot;pattern&quot;.

Through TS file - Use ASCII values for comma validations. If user enters a comma, ASCII code for comma will be matched. Use if else .

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