Solved

PHP/REGEX: Find First Number

Posted on 2012-03-22
3
443 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
  • 2
3 Comments
 
LVL 35

Accepted Solution

by:
Terry Woods earned 500 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

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
How would I construct this INSERT statement in PDO? 6 29
PHP Mail error 3 42
How Close unsubmited attempts 10 42
php subtract from date 2 26
Foreword (July, 2015) Since I first wrote this article, years ago, a great many more people have begun using the internet.  They are coming online from every part of the globe, learning, reading, shopping and spending money at an ever-increasing ra…
3 proven steps to speed up Magento powered sites. The article focus is on optimizing time to first byte (TTFB), full page caching and configuring server for optimal performance.
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…
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

685 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