Missing few characters from regex string, when passing it through an external application to the webapi

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C#

ASP.NET

regular-expression

I've two get methods in my WebAPI, which are:

CheckPassword(string Password, string regExp) //to validate password pattern, takes password and the regular expression.

CheckEmailValid(string Email, string regExp) //to validate email pattern, takes email and its regular expression.

When I try to call a Get method in WebAPI by passing two strings(password, regExp) OR (email, regExp) using a console app, some of the character miss out from the string. But at the same time if I have the regular expression in my WebAPI and test, it works fine. So I miss few character somewhere between the application and the webAPI.

Original Regex string for Password

public const string passwordPattern = @"^(?=.*[0-9]+.*)(?=.*[a-zA-Z]+.*)[0-9a-zA-Z]{7,}$"

The string which I receive at WebAPI Method while debugging

{^(?=.*[0-9] .*)(?=.*[a-zA-Z] .*)[0-9a-zA-Z]{7,}$}

Here I'm missing out + symbol, thats why password validation fails all the time.

Original Regex string for Email

public const string emailPattern = @"\A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z";

The string which I receive at WebAPI Method while debugging

\\A(?:[a-z0-9!

Any help will be greatly appreciated.

What I have tried:

I tried storing the regular expression text in a constant variable and pass, but still same characters where missing.