https://github.com/dialogflow/fulfillment-regex-nodejs
shows an easy way to perform a regex validation, however I haven't succeeded in creating one for email addresses.
from the original regex i changed the pattern to [^\s]*#[a-z0-9.-]
changed the dialogflow parameter to email with $email and kept the rest the same.
function validateEmployeeID (agent) {
// get the employee ID parameter from the request header received from Dialogflow
let email = agent.parameters.email;
let pattern = /[^\s]*#[a-z0-9.-]/;
if (email.match(pattern) !== null)
{ agent.add(`Email is wrong, please provide a valid email address.`); }
else { agent.add(agent.request_.body.queryResult.fulfillmentText); }
}
If you just want to create a regex for email validation then there are lots of links available.
You may try the below one from here.
/[A-Z0-9._%+-]+#[A-Z0-9-]+.+.[A-Z]{2,4}/igm
and test it online here
after some research, I have had success with this regex
^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+#[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$
more info here for others interested; https://blog.dialogflow.com/post/validate-entities-using-regular-expressions-in-fulfillment/
Related
GOAL:
I'm trying to validate the user's email address as he/she types.
I'm just using simple regex because I don't want to use any external library. Also if use the regex like in here regex email for java I'm encountering error PatternSyntaxException that's why I prefer simple regex for now.
So I put the TextFormatter and UnaryOperator inside the initialize method.
#FXML
public void initialize()
{
//1. USE UNARY FIRST TO MAKE FILTER BEFORE USING TEXTFORMATTER
UnaryOperator <TextFormatter.Change> filterEmail = (change ->{
if(change.getControlNewText().matches("^(.+)#(.+)$*"))
{
lblEmailError.setVisible(false);
txtEmailAdd.setBorder(null);
return change;
}
else
{
lblEmailError.setText("Invalid Email");
lblEmailError.setVisible(true);
txtEmailAdd.setBorder(new Border(new BorderStroke(Color.RED, BorderStrokeStyle.SOLID, new CornerRadii(3), new BorderWidths(2), new Insets(-2))));
return null;
}
});
TextFormatter <String> tf = new TextFormatter<String>(filterEmail);
txtEmailAdd.setTextFormatter(tf);
}
But as long as the FXML loads I can't type anymore in the TextField and can't be edited anymore. I can't type anything. Maybe there is something wrong with my condition or I'm wrong putting it inside the initialize method.
I'm lost. I have already dug the web on how to validate email in java using regex.
like this Java regex email
I'm also using SceneBuilder to build the fxml. Any help will do thanks in advance.
I'm using email validation of zend framework and when I give email address as abcde#gester.tech and it responded with invalid validation. Then I modifed the validation as below.
$emailValidator= new Validator\EmailAddress(Validator\Hostname::ALLOW_DNS | Validator\Hostname::ALLOW_LOCAL);
$emailRegex= new Validator\Regex(
array(
'pattern' => '/^(?:(?:[^<>()\[\]\\.,;:\s#"]+(?:\.[^<>()\[\]\\.,;:\s#"]+)*)|(?:".+"))#(?:(?:\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(?:(?:[a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/',
'messages'=>array(
'regexNotMatch'=>'Make sure your email pattern is correct'
)
)
);
$emailInp->getValidatorChain()->addValidator($emailValidator)->addValidator($emailRegex);
Now am able to pass the email address (abcde#gester.tech) with out validation error. But if I give the input as abcde#gester it also take as valid input. But I want to restrict that and I think this can be implemented by adding regex to this validation. May I know how to implement that.
$emailValidator= new Validator\EmailAddress(
Validator\Hostname::ALLOW_DNS |
Validator\Hostname::ALLOW_LOCAL);
$emailRegex= Validator\Regex(array('pattern' => '/^(?:(?:[^<>()\[\]\\.,;:\s#"]+(?:\.[^<>()\[\]\\.,;:\s#"]+)*)|(?:".+"))#(?:(?:\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(?:(?:[a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/'));
$emailInp->getValidatorChain()->addValidator($emailValidator->addValidator($emailRegex));
There is a Regex Validator support in Zend framework which facilitates matching the user-defined regex pattern. There is a pattern option which sets the regular expression pattern for the given validator.
You can use it to match the user-defined validator i.e. the pattern that suits your need.
SYNTAX:
$validator = new Zend\Validator\Regex(array('pattern' => '/your_desired_regex_pattern_here/'));
For matching the valid email address that suits your need you can fill in the pattern with available regex validators for email addresses. Also as per the Zend docs; the regex validator uses PCRE(php) syntax, so you can use PCRE regex flavor.
A sample example:
$validator = new Zend\Validator\Regex(array('pattern' => '/^(?:(?:[^<>()\[\]\\.,;:\s#"]+(?:\.[^<>()\[\]\\.,;:\s#"]+)*)|(?:".+"))#(?:(?:\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(?:(?:[a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/'));
$validator->isValid("abcde#gester.tech"); // returns true
$validator->isValid("abcde#gester"); // returns false
$validator->isValid("Someemail#someDomain.com"); // returns true
If you want to chain multiple validators on a single input data you can also use the below syntax:
$validatorChain = new Zend_Validate();
$validatorChain->addValidator(
new Zend\Validator\Regex(array('pattern' => '/^(?:(?:[^<>()\[\]\\.,;:\s#"]+(?:\.[^<>()\[\]\\.,;:\s#"]+)*)|(?:".+"))#(?:(?:\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(?:(?:[a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/'))
->addValidator(new Zend_Validate_Alnum()); // Second validator...You can chain multiple
if ($validatorChain->isValid($input_email)) {
// email passed validation
} else {
// email failed validation; print reasons
foreach ($validatorChain->getMessages() as $message) {
echo "$message\n";
}
}
You can find the demo of the above regex in here.
Reference: The regex for validating email address is taken from this answer.
I want to make a custom validator that should check the input Url is valid or not.
I want to use the following regex that I tested in expresso, but comes off invalid when used in typescript (the compiler fails to parse it):
(((ht|f)tp(s?))\://)?((([a-zA-Z0-9_\-]{2,}\.)+[a-zA-Z]{2,})|((?:(?:25[0-5]|2[0-4]\d|[01]\d\d|\d?\d)(?(\.?\d)\.)){4}))(:[a-zA-Z0-9]+)?(/[a-zA-Z0-9\-\._\?\,\'/\\\+&%\$#\=~]*)?
The above url checks for optional http:\\\ and also will validate an Ip address
The following url's should be valid :
192.1.1.1
http://abcd.xyz.in
https://192.1.1.126
abcd.jhjhj.lo
The following url's should be invalid:
192.1
http://hjdhfjfh
168.18.5
Kindly assist
The forward slashes / are not escaped in the regex.
What is valid or invalid in Javascript is valid or invalid in Typescript and vice-versa.
There may be another option for you, that relies on the URL class. The idea is to try converting the string into a URL object. If that fails, the string does not contain a valid URL.
public isAValidUrl(value: string): boolean {
try {
const url = new URL(value);
return isValid(url.pathname);
} catch (TypeError) {
return false;
}
}
isValid(value: URL): boolean {
// you may do further tests here, e.g. by checking url.pathname
// for certain patterns
}
Alternatively to returning a boolean you may return the created URL or null instead of a boolean or - if that exists in JavaScript or TypeScript: something like an Optional<URL>. You should adapt the method's name then, of course.
I need to send a custom email message to every User of a list ( List < User > ) I have. (I'm using C# .NET)
What I would need to do is to replace all the expressions (that start with "[?&=" have "variableName" in the middle and then ends with "]") with the actual User property value.
So for example if I have a text like this:
"Hello, [?&=Name]. A gift will be sent to [?&=Address], [?&=Zipcode], [?&=Country].
If [?&=Email] is not your email address, please contact us."
I would like to get this for the user:
"Hello, Mary. A gift will be sent to Boulevard Spain 918, 11300, Uruguay.
If marytech#gmail.com is not your email address, please contact us."
Is there a practical and clean way to do this with Regex?
This is a good place to apply regex.
The regular expression you want looks like this /\[\?&=(\w*)\]/ example
You will need to do a replace on the input string using a method that allows you to use a custom function for replacement values. Then inside that function use the first capture value as the Key so to say and pull the correct corresponding value.
Since you did not specify what language you are using I will be nice and give you an example in C# and JS that I made for my own projects just recently.
Pseudo-Code
Loop through matches
Key is in first capture group
Check if replacements dict/obj/db/... has value for the Key
if Yes, return Value
else return ""
C#
email = Regex.Replace(email, #"\[\?&=(\w*)\]",
match => //match contains a Key & Replacements dict has value for that key
match?.Groups[1].Value != null
&& replacements.ContainsKey(match.Groups[1].Value)
? replacements[match.Groups[1].Value]
: "");
JS
var content = text.replace(/\[\?&=(\w*)\]/g,
function (match, p1) {
return replacements[p1] || "";
});
I am using MVC 3.
I have a text area in which user can enter multiple emails addresses. Emails can be separated by a comma and a space. User may hit enter in the box as well.
Is there an attribute that can handle this scenario?
I am using regular expression to check for the characters and it is failing for "abc#abc.com, tyz#tyz.com"
Here is my regular expression:
[RegularExpression(#"([a-zA-Z0-9 .#-_\n\t\r]+)", ErrorMessage = ValidationMessageConstants.EmailAdressInvalid)]
What am i missing here? This regular expression is off the following post:
DataAnnotations validation (Regular Expression) in asp.net mvc 4 - razor view
Out of the box, .NET 4.5 has the System.ComponentModel.DataAnnotations.EmailAddressAttribute found in the System.ComponentModel.DataAnnotations assembly, but this is limited to validating just one email address. Hence, if you have a model that accepts delimitted email address and you decorate the property with this attribute, it will fail since it will treat the entire string as one email.
What I've done is create an extended emailaddress attribute that validates the delimited email addresses:
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public class EmailAddressExAttribute : DataTypeAttribute
{
#region privates
private readonly EmailAddressAttribute _emailAddressAttribute = new EmailAddressAttribute();
#endregion
#region ctor
public EmailAddressExAttribute() : base(DataType.EmailAddress){ }
#endregion
#region Overrides
/// <summary>
/// Checks if the value is valid
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public override bool IsValid(object value)
{
var emailAddr = Convert.ToString(value);
if (string.IsNullOrWhiteSpace(emailAddr)) return false;
//lets test for mulitple email addresses
var emails = emailAddr.Split(new[] {';', ' ', ','}, StringSplitOptions.RemoveEmptyEntries);
return emails.All(t => _emailAddressAttribute.IsValid(t));
}
#endregion
}
You can now decorate any string property with this new extended attribute to validate delimited email addresses. You can update the delimiters to include any special characters you want to use as well.
Hope this helps!
You not stating what the question is, so I will have to assume from your answer that data annotations aren't working as you would expect.
Having that assumption in mind, its very easy why is it not working: data annotation operates on the entire field, text area in your case. It will work as expected if you have only one email. Since you have multiple emails in that field, separated by comma or space, the field in its entirety doesn't reflect what data annotation for email prescribes and fails.
To answer your numbered questions:
No, there is no out of the box
The regular expression you using doesn't account for multiple emails, but one. The solution in your case will be either to
Data annotation using RegEx for multiple emails separated as you'd like or
Have custom validation attribute doing it for you
Following the links above you will see very good examples of "how to" and hopefully get you going in the right direction.
Hope this helps, please let me know if not.