Question 381709 in Javascript Question posted in
A very good W3school tutorial can be found here.

How to keep a single backslash in JavaScript?

I’m working on a project where this string ^[email protected]$ is stored in a parameter.
It’s possible to retrieve it in the JS part using @Params.RegexMail.

I can’t modify the value of @Params.RegexMail beforehand.

I tried to do console.log("@Html.Raw(@Params.FiltreEmail)"); and even

var x = "@Html.Raw(@Params.FiltreEmail)".replace("\", "\\"); 
console.log(x);

but both ways ended up by returning ^[email protected]$.

My goal is to be able to define the following regex:

var exp = ("@Html.Raw(@Params.FiltreEmail)" !== "") ? "@Html.Raw(@Params.FiltreEmail)" : "(.*)";
var regex = new RegExp(exp);

How can I achieve this ?

Tags:

2

Answers


  1. 0

    If you’re not seeing any slashes when you log the string containing the regular expression directly to the console, it suggests that the slashes are being removed or interpreted in a different way before they reach the console. This might be due to how the framework or environment you’re working in processes strings.

    In this case try to use
    console.log(String.raw(filtreEmail));

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  2. 0

    The .replace("\", "\\") would only replace the FIRST set, but they would already have been lost when declared.

    Instead use server side JSON encode:

    // @using System.Web.Helpers

let escapedRegex = `^\S+@demo\.com$` // "@Html.Raw(Json.Encode(Params.FiltreEmail))"; // Server-side rendering happens here

console.log(escapedRegex); // Check if the escaping is done right

let exp = escapedRegex? escapedRegex : "(.*)";
let regex = new RegExp(exp);
console.log(regex); // This should now show /^[email protected]$/ or /(.*)/
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