javascript - Checking for charater '\' from an input text -

basically tring restrict special characters input.

var ichars = "[!@#$%^&*()+=\\-\\[\\]\\\';,./{}|\":<>?\\n]{1}"; if(((document.all.tranrmks.value).search(ichars)) != -1){      alert("speacial characters not allowed in notes");      return false; } 

but need check character '\' .

if(((document.all.tranrmks.value).indexof("\"))>=0){     alert("\ not allowed");     return false; } 

but above code not working me..please let me know other way check \.

as @vohuman has said, backslash escapes next character here closing literal("). use \\ instead.

if(((document.all.tranrmks.value).indexof("\\"))>=0){     alert("\\ not allowed");     return false; } 

or

you use includes() functions checks existence of string given.

 if((document.all.tranrmks.value).includes("\\")){         alert("\\ not allowed");         return false;     }