Regular expression

Posted on 2014-03-30
Last Modified: 2014-03-30
Looks like my understanding of negative lookaheads is lacking.

I have this test string:

Open in new window

and the following expression:

Open in new window

I want to match "text" followed by "code" in the same row.
That is, "code" should follow "text" before "<\tr>".
In the sample, the only match should be

Open in new window

How can I write the regular expression for that?
Question by:Dan Craciun
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 75

Accepted Solution

käµfm³d   👽 earned 500 total points
ID: 39965500
I believe this is what you are after:


Open in new window

Basically, you simply look ahead of the current character matched by the dot, and you check to make sure that the following text is not the closing row tag. There may be a more elegant way to do it, but this should suffice for your current need.

You may find my article on regular expression lookaround useful:
LVL 35

Author Closing Comment

by:Dan Craciun
ID: 39965719
I kept writing the lookahead as
and it refused to work.

Thank you, kaufmed.

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I have been reconstructing a PHP-based application that has grown into a full blown interface system over the last ten years by a developer that has now gone into business for himself building websites. I am not incredibly fond of writing PHP code o…
Whatever be the reason, if you are working on web development side,  you will need day-today validation codes like email validation, date validation , IP address validation, phone validation on any of the edit page or say at the time of registration…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question