I am new in learning Angular2, and I want to make a validation form that verifies emails after a RegEx pattern.
My code looks something like this but I don't have any idea if I am doing it right, or what I did wrong, can somebody please help me a bit?
Angular 4 has a built-in "email" validation tag that can be added within the input. E.g.:
<input type="email" id="contactemail" email> This will be valid for a series of numbers and letters then an @ then another series of letters. It will not account for the dot after the @ -- for that you can use the "pattern" tag within the input and your standard regex.
<input type="text" class="form-control" #userEmail="ngModel" name="email" [(ngModel)]="email" pattern="^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$" [ngClass]="{invalid : userEmail.touched && !userEmail?.valid}" required email>
*ngIf condition for showing error message??Try Something like that
<div class="alert-email"> <label>Email</label> <input id="contactemail" type="text" #contactemail="ngModel" [(ngModel)]="model.contactemail" required pattern="^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$"> <div class="md-errors-spacer" [hidden]="contactemail.valid || contactemail.untouched"> <div *ngIf="contactemail.errors && contactemail.errors.required"> Email is required </div> <div *ngIf="contactemail.errors && contactemail.errors.pattern"> Email is invalid </div> </div> </div> 
Angular 4 Email Validation :
Final :
`<input type="email" [(ngModel)]="enterEmail" name="myEmail" #myEmail="ngModel" email pattern="[a-zA-Z0-9.-_]{1,}@[a-zA-Z.-]{2,}[.]{1}[a-zA-Z]{2,}" required>` 
[a-zA-Z0-9.**-**_]{1,}@[a-zA-Z.-]{2,}[.]{1}[a-zA-Z]{2,}. The minus char must be escaped. I prefer ^[a-zA-Z]{1}[a-zA-Z0-9.\-_]*@[a-zA-Z]{1}[a-zA-Z.-]*[a-zA-Z]{1}[.][a-zA-Z]{2,}${1} was written by someone who is only just beginning to learn about regular expressions.You can use this pattern for your email inputs:
^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$ This pattern accepts "sample@domain" also in addition of "[email protected]". Using this email pattern "sample@domain." is not acceptable and 1 letter domain tld is not allowed ("[email protected]" goes wrong).
For multiple email validation in a single field, you can do using the custom email validator.
import { FormControl } from '@angular/forms'; export class EmailValidator { public static isValid(email) { var re = /^(([^<>()\[\]\\.,;:\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,}))$/; return re.test(String(email).toLowerCase()); } static isMultiValid(control: FormControl): any { console.log(control.value); let tempEmail = control.value; let invalid = false; let regex =/[a-z0-9!#$%&'*+=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/g; if(tempEmail.indexOf(',') > -1){ var emails = control.value.split(','); for (let email of emails) { console.log(email); let isValid = EmailValidator.isValid(email) if(!isValid){ return{"email not valid":isValid} } } return null; } else{ let email = control.value.split(','); if( email == "" || ! regex.test(email)){ invalid = true; return { "email not valid": invalid }; } console.log("valid"); return null; } } } .
Try this:
^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$ 
This pattern worked for me which will accept alphanumeric characters and '.' special character.
^[\\w]+(?:\\.[\\w])*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$ this pattern email working :
<input pattern="^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$"> Solution originally posted by the OP as part of the question:
<div class="alert-email"> <label for="contactemail">EMAIL: </label> <input type="email" id="contactemail" name="contactemail" required ng-pattern="/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/" [(ngModel)]="model.contactemail" #contactemail="ngModel" placeholder="Your email" /><br><br> <div *ngIf="contactemail.errors && (contactemail.dirty || contactemail.touched)" class="alert-email alert-danger-email"><br> <div [hidden]="!contactname.errors.required"> Email is required </div> <div [hidden]="!contactname.errors"> Please input a valid email. </div> </div> </div>
This pattern worked for me :
pattern="[a-zA-Z0-9.-]{1,}@[a-zA-Z.-]{2,}[.]{1}[a-zA-Z]{3,}" Try This One it will work:
^[a-zA-Z]+([.-]?[a-zA-Z0-9]+)*@([a-zA-Z]+([.-]?[a-zA-Z]))[.]{1}[a-zA-Z]{2,}$ 
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