?
Solved

PHP/REGEX: Find First Number

Posted on 2012-03-22
3
Medium Priority
?
457 Views
Last Modified: 2012-03-22
Using PHP, how can I find the first number?

<?php

echo firstNumber('abc 123 hello 567'); // Should echo 123
echo firstNumber('5 abc 123 hello 567'); // Should echo 5
echo firstNumber('abc hello'); // Should not echo anything

?>
0
Comment
Question by:hankknight
[X]
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
  • 2
3 Comments
 
LVL 35

Accepted Solution

by:
Terry Woods earned 2000 total points
ID: 37755303
Tested and working:

function firstNumber($mytext) {
  if (preg_match("/\d+/",$mytext, $matches))
    return $matches[0];
  else
    return "";
}
0
 
LVL 16

Author Comment

by:hankknight
ID: 37755319
Thanks, TerryAtOpus, but I get an error:
Notice: Undefined offset

<?php

echo firstNumber('abc 123 hello 567'); // Should echo 123
echo firstNumber('5 abc 123 hello 567'); // Should echo 5
echo firstNumber('abc hello'); // Should not echo anything
echo firstNumber('abc4hello'); // Should echo 4

function firstNumber($mytext) {
  if (preg_match("/\d+/",$mytext, $matches))
    return $matches[1];
  else
    return "";
}

?>

Open in new window

0
 
LVL 35

Expert Comment

by:Terry Woods
ID: 37755327
I did an edit to fix a bug in it when I tested it - it should be $matches[0]
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

These days socially coordinated efforts have turned into a critical requirement for enterprises.
Since pre-biblical times, humans have sought ways to keep secrets, and share the secrets selectively.  This article explores the ways PHP can be used to hide and encrypt information.
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…
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.
Suggested Courses

649 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