Javascript 转义字符串转义序列的反斜杠

Question

I want to detect wheather user has entered any whitespace character(\n,\t,\v,\r,etc) in password. I created a function to detect using regex, and call it when user submits the form.

When i fetch the password value, javascript escapes the string escape squences's backslash. I mean it convert \n to \\n, so my regex returns false. Here is my code:

        let form = document.querySelector("form")
        let inp = document.querySelector("#inp");
        const hasWhitespace = (s)=>{
            return /\s/.test(s)
        };

        form.addEventListener('submit',(e)=>{
            e.preventDefault()
            if(hasWhitespace(inp.value)){
                alert("whitespaces not allowed ")
            }
        })

I have used replaceAll("\\\\","\\") to replace double backslash into single but it didn't work.

Thanks for your answer

Answer 1

If you're restricting your user from entering any whitespace then you simply use.trim() method

like this let inp = document.querySelector("#inp").trim();