I'm not very good with regular expressions, so I decided to seek some help.
Here's the regular expression I have:
/[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/;
It works for most cases of email validation, but it allows an undesired format through:
How can I modify the above Regular Expression to prevent consecutive periods anywhere in the string?
Thank you.
To prevent matching two consecutive dots, simply include a negative lookahead at the beginning of your regular expression:
/^(?!.*\.{2})[a-z0-9etc...
------------
This adjustment will cause the match to fail if there are two consecutive periods anywhere in the string, without needing any other changes to your original regular expression.
However, it may be better to reconsider using regular expressions for validating email addresses since your current approach appears to be flawed. You might want to explore alternatives like:
Avoid using email address validation with regex as it is prone to errors. While the email address may be functional in practice, it is technically invalid according to the relevant RFC guidelines.
Remember: relying solely on regex for validating email addresses can lead to inaccuracies.
// Effective email validation Regex^[A-Za-z0-9_%+-]+(?:\.[A-Za-z0-9_%+-]+)*@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$This Regex is designed to prevent emails from starting or ending with a period, and also disallows consecutive periods and special symbols.
There's no need to reinvent the wheel ;)
Take a look at this link for more information:
I hold a dataset with employment history. There are two fields for the employment dateTo: yearTo, monthTo To accurately sort the employment history by the most recent dateTo, I utilize the following code: <tr id="employment_history_" ng-repeat="histo ...
According to this source, it is feasible to install npm packages before creating the package.json file. After installing nodeJS on my computer, I attempted to run the following command in an empty directory: npm install jQuery This resulted in the follow ...
When I click on the image (class = 'scrollTo'), I want the page to scroll down to the next div (second-container). I've tried searching for a solution but nothing seems to work. Whenever I click, the page just refreshes. Any help would be gr ...
Snippet of my RxJS code: .mergeMap(action => { const user = store.getState().user; return ajax.post(`${config.API_BASE_URL}/api/v1/rsvps`, { rsvp: { meetup_id: action.payload, user_id: user.id, } }) .map(action => calenda ...
Could someone lend a hand with sorting JSON data in ReactJs? I'm having trouble getting it to work properly. Also, if I want to sort by title, would it be the same process? Thanks! This is what I've tried so far: componentDidMount() { ...
Currently, I am working on a content page that uses a master page which includes a text box and a button. My goal is to have the button execute some JavaScript code before performing any other actions. At the moment, I am in the testing phase of this JavaS ...
In my Angular application, I have implemented an input field with the onkeypress event handler to automatically remove any commas entered by the user: <input name="option" ng-model="main.optionToAdd" onkeypress="this.value = this.value.replace(/,/g ...
How come myCtrl.greeting doesn't automatically update when I change myCtrl.name? angular.module('MyApp', []) .controller('MainController', [function(){ var mCtrl = this; mCtrl.name = ''; mCt ...
I have an Upper and Lower div in my HTML code. I am trying to display the Lower div only if the Upper div is present, otherwise hide it. Is there a way to achieve this using CSS without using Jquery or Javascript? Note: No modifications should be made t ...
How should I properly document this code snippet: // Define a collection of colors with methods colors = { // Define method for color red "red" : function() { // Do something... } // Define object for color black "black" : { // Add ...
I have 2 queries that will return results which I plan to use in JSON format. The first query is $query = "SELECT * FROM info_location WHERE location_id=".$id.""; and the second query $query = "SELECT t1.location_id,t1.street,t1 ...
I am currently facing a challenge where I need to send data programmatically without using form fields directly to a python CGI script. The issue lies in not knowing how to extract this data in Python. Normally, with a form, I could use "form = cgi.FieldSt ...
Is it possible to maintain line breaks in a textarea using PHP? Currently, I have a temporary solution that involves using the exec function to run a shell command, but I would prefer a purely PHP approach. Below is my temporary script - can you help me mo ...
I'm starting to uncover a mysterious aspect of Javascript that has eluded me thus far. Recently, I've been pulling an array of objects from a database using Sequelize. This array is quite intricate, with several associations included. Here' ...
I have been working on creating a responsive diagonal layout with slanted shapes (refer to the image attached). However, I'm facing a challenge with aligning the edges smoothly at different screen sizes, especially when the rows grow and the screen re ...
I am facing an issue where I am trying to delete multiple objects from an array by selecting the checkbox on a table row. However, I am only able to delete one item at a time. How can I resolve this problem and successfully delete multiple selected objects ...
Currently, I'm tackling an assignment that involves utilizing if statements and switch statements. Here is a snippet of code that I am working on: if (validateField(document.forms[0].name) == false) { isValid = false; } if (validateField(docume ...
After embedding a PDF object on my webpage, I noticed that when loading the page and scrolling using the mouse wheel, it actually scrolls up and down inside the PDF instead of moving through the entire page. To fix this issue, I have to first click in a bl ...
I am in the process of creating a dynamic data-binding function named assemble that requires two input parameters: server response (JSON) - nested JSON object. instruction set (JSON) - a configuration object that dictates the binding. The Issue: The cur ...
I am trying to create a tabbed content functionality with multiple elements. How can I utilize the same function for various elements declared in a variable? For example, I want to clone the parent div.tabs element with similar content but different ids an ...