[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

preg_replace with dash

Posted on 2011-03-04
8
Medium Priority
?
928 Views
Last Modified: 2012-05-11
Hi,

Just a quick question. I'm wondering if this code:
     function create_slug($string){  
    $slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string);  
    return $slug;  
  }  

Open in new window


will replace all instances of any character that is a letter or number with the dash. It's supposed to create user friendly post slugs from title string to use within URLs.

Thanks,
Victor
0
Comment
Question by:Victor Kimura
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 7

Expert Comment

by:Vimal DM
ID: 35034747
Hai,

Just a slight modification there in your function

  function create_slug($string){  
    $slug=preg_replace('/[^A-Za-z]+/', '-', $string);
      
    return $slug;  
  }  
0
 
LVL 34

Accepted Solution

by:
Beverley Portlock earned 1000 total points
ID: 35035140
The pattern you posted '/[^A-Za-z0-9-]+/' will replace all characters that are NOT 0-9, A-Z, a-z or a dash

0
 

Author Comment

by:Victor Kimura
ID: 35035457
Hi bportlock,

Where is the NOT sign?

Thanks,
Victor
0
Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

 
LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 1000 total points
ID: 35035584
[^ ... ]

Open in new window


Means any character not in this character set. Remove the chevron to make it any character in this set.
0
 
LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 1000 total points
ID: 35035607
P.S.

The chevron only makes it a "not" when it is listed as the first character in the character set. Listed anywhere else, it is a literal character.

Examples:

[^abc]  - Any character NOT a, b, or c
[abc]   - a, b, or c
[abc^]  - a, b, c, or chevron
[^abc^] - Any character NOT a, b, c, or chevron
[^^]    - Any character NOT a chevron

Open in new window

0
 
LVL 34

Assisted Solution

by:Beverley Portlock
Beverley Portlock earned 1000 total points
ID: 35036525
"....Means any character not in this character set. Remove the chevron to make it any character in this set....."

Why didn't they use ! to mean NOT like many programming languages..... oh well

@vkimura2007 - I can understand your confusion look at this

 /^[^a-z]+[a-z]*$/

That means "any string starting (^) with characters that are NOT a-z ([^a-z]) ..... " etc. It's unfortunate that regex syntax looks like the leftovers from the Scrabble box....
0
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 35036836
>>  ...regex syntax looks like the leftovers from the Scrabble box...

lol   = )
0
 

Author Closing Comment

by:Victor Kimura
ID: 35040801
Thanks, fellas. I totally agree. They should have simplified the regex patterns and be consistent with the other programming languages. =)
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

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

Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
It’s a season to be thankful, and we’re thankful for users like you who engage on site, solve technology problems, and network with others in the industry. What tech are we most thankful for? Keep reading.
The viewer will learn how to count occurrences of each item in an array.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…
Suggested Courses

611 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