To restrict special characters in a Single Line Textbox

[Community Alums]

in Choice box -To restrict special characters in a Single Line Textbox?

[J Siva]

Hi @Community Alums 
You can use client scripts with Regex to validate user input. Please share more details about where you're planning to implement this validation.

Regards,
Siva

[Anurag Tripathi]

If you know what all characters to restrict, a simp[le way would be using a client script as below

var string = g_form.getValue('field_name');
if (string.indexOf("#") > -1 || string.indexOf("*") > -1) { //here its restricting # and *, tyou can add more
alert("Please do not use the # or * characters");
g_form.clearValue('field_name');
}

Below is a more elaborate solution using regex

Solved: Restriction validation for single line text field - ServiceNow Community

[kaushal_snow]

Hi @Community Alums ,

You can create an onChange client script that triggers whenever the value of the Single Line Text field changes. 

var regex = /[!@#$%^&*(),.?":{}|<>]/g;
if (regex.test(newValue)) {
alert('Special characters are not allowed.');
g_form.setValue(control.name, oldValue); 

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