Javascript regular expression fails to find a match

Is there a way to match all strings except for the ones containing '1AB'? I attempted it but it returned no matches.

var text = "match1ABmatch match2ABmatch match3ABmatch";
var matches = text.match(/match(?!1AB)match/g);
console.log(matches[0]+"..."+matches[1]);

Answer №1

When using lookarounds in regex, the text is not consumed and the regex index does not move when their patterns are matched. For more information, check out Lookarounds Stand their Ground.

To match the text, you still need to use a consuming pattern such as \w+ for word matching. Alternatively, you can use \S+ for one or more non-whitespace characters. If any characters, including line breaks, need to be matched, use .+ (matches 1 or more characters other than line break characters) or [^]+ (matches even line breaks).

var text = "match100match match200match match300match";
var matches = text.match(/match(?!100(?!\d))\w+match/g);
console.log(matches);

Details of the Pattern

  • match - a literal substring
  • (?!100(?!\d)) - a negative lookahead that fails the match if immediately to the right there is the substring 100 not followed by a digit. If you want to fail matches where the number starts with 100, remove the (?!\d) lookahead.
  • \w+ - 1 or more word characters (letters, digits, or _)
  • match - a literal substring

Check out the online regex demo.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Developing tests for an asynchronous function

I recently encountered a bug in my AWS Lambda code written in NodeJS 6.10 that caused me two sleepless nights. I didn't conduct integration testing, relying solely on unit tests, which led to the oversight. After inserting return workerCallback(err);, ...

When accessing the innerHTML and outerHTML properties on an HTMLElement, they may return undefined without triggering

Task: My goal is to take an HTML string, make changes to certain attributes of image tags within it, and then return the modified HTML string. The function I have developed follows these steps: private resolveImagesInHTML (body: string): string { le ...

drag and zoom feature similar to Google Maps

Is it possible to create draggable effects similar to Google Maps on a group of div elements? Are there any JavaScript libraries available that can replicate this functionality? ...

What is the process for including an optional ngModelGroup in Angular forms?

I'm encountering an issue with incorporating the optional ngModelGroup in angular forms. Although I am familiar with how to use ngModelGroup in angular forms, I am struggling to figure out a way to make it optional. I have attempted to pass false, nu ...

Receiving no communication from Express Router

Having trouble receiving a response from the server after making get/post requests. I've tried adjusting the order of functions in index.js without success. I also attempted to send a post request using Postman to localhost:8080/register, but the requ ...

What causes the failure of making an ajax call tied to a class upon loading when dealing with multiple elements?

I can see the attachment in the console, but for some reason, the ajax call never gets triggered. This snippet of HTML code is what I'm using to implement the ajax call: <tr> <td>Sitename1</td> <td class="ajax-delsit ...

A useful tip for emphasizing tags that have attributes with endings

Here is the HTML list I'm working with: <li class=​"info" data-info=​"" data-title=​"info 1" data-info-id=​"222643">…</li> <li class=​"info" data-info=​"" data-title=​"info 2" data-info-id=​"217145">…</li> ...

Personal Information Management

After making a request for stormpath user custom data, I used the following code: res.render('home', { title: 'home', user: req.user.customData, }); Instead of receiving a JSON object of custom data as expected, a URL ('') ...

How to effectively pass data between parent and child controllers in Angular 1 - Seeking guidance

Currently, I am working on two separate applications that have a common requirement of displaying active incidents and closed incidents. Both apps involve similar logic for creating, modifying, saving, and deleting incidents. I am exploring the best appro ...

Accomplishing Nested Element Retrieval in Javascript

While this question may have been asked previously, it hasn't been tackled quite like this before... I have the following block of HTML code. <table class="fr ralign cartSummaryTable"> <tr> <td width="320px"> <div cl ...

Incorporate JSON data using jQuery's AJAX in MVC3

I need assistance with parsing the JSON data retrieved from a webservice through my controller. Currently, I am displaying the entire JSON string in a div as text. However, I only want to extract specific values such as "color" and "size". I am unsure of ...

Utilizing Various Perspectives in Angular with the ng-view Directive

Can anyone assist me with a challenge I'm facing regarding views? While this is a hypothetical scenario and there's no code available to review... Let's imagine a simple site with three routes: /signin /users /users/:id Upon accessing t ...

AngularJS - Smoothly navigate to the top of the page by swiping left or right

I'm currently working on a project in angularJS and ionic that involves a slidebox with three slides, each containing different content. My goal is to scroll back to the top every time I switch between slides. Initially, I thought using on-swipe-left ...

Unable to utilize material tabs in this situation

Discovering the material tabs feature at https://material.angular.io/components/tabs/api#MatTab got me excited to implement it in my project. After adding the suggested import, I encountered an issue where I couldn't find the module "@angular/materia ...

The input type "number" does not seem to be compatible with the currency pipe feature

The currency pipe seems to not be working when using the input type number. The web page is not displaying any value. I have searched various blogs and it appears that the currency pipe only works with input type text, but my requirement necessitates the ...

Div scrolling allows for parallel viewing of PDFs in a side by side arrangement

I have two scrollable elements on my webpage: one positioned on the left side and the other on the right side. The left element is a regular div, while the right element is an object containing an embedded PDF. <object width="100%" height=&quo ...

Having trouble displaying Json data on an HTML page?

I am trying to incorporate a local JSON file into an HTML page using JavaScript. I have successfully loaded the data from the JSON file into the console, but I'm encountering issues when trying to display it on the HTML page. Could someone please revi ...

Calculating the sum of all words that have been successfully finished

My spelling game includes words of different sizes ranging from 3 to 6 letters. Once a certain number of words are completed in the grid, the remaining grid fades away. Instead of only considering one word size at a time, I want the game to calculate the t ...

Utilizing Vue.js to Showcase Real-Time Data on an HTML Page

I am attempting to showcase the bill structure on an HTML page by retrieving data in Vue and Axios. There is a table where orders are listed, with each row having a "Print" button. When this button is clicked, I want to display the specific order details i ...

Calculating response time in Selenium with VB.NET: A comprehensive guide

I'm working on creating an automated test to calculate the average response time for a screen's responsiveness. My tools of choice are Selenium and VB.net. Can someone please provide guidance on how to accurately calculate this? The waitforpage() ...