Solved

Check string matches pattern

Posted on 2004-03-26
9
376 Views
Last Modified: 2008-02-01
Hi everyone,

Basically, I want to check if a string is base64 encoded. If you can think of a good way to do this (other than the way I'm about to suggest), please tell me!

I think I want to check if the string contains only letters of the alphatbet (both uppercase and lowercase), numbers, equal signs (=) forward slashes (/) and no spaces. If the string is like this, I'm going to treat it as base64 encoded.

I've no idea how I would check a string for this. I suppose I would use preg_match or ereg or some other simliar function, but learning all that syntax is just too complicated. Would someone give me a function I could use?

Many thanks in advance...
0
Comment
Question by:edwinbrains
[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
  • 4
  • 3
  • 2
9 Comments
 
LVL 12

Expert Comment

by:venkateshwarr
ID: 10689851

did you try recode_string()?

check the link for other details...

http://www.php.net/manual/en/function.recode-string.php
0
 
LVL 12

Expert Comment

by:venkateshwarr
ID: 10689883
recode() is also same....
I dont know, but it seems there are bugs with recode()..try iconv()

http://www.php.net/manual/en/ref.iconv.php
0
 

Author Comment

by:edwinbrains
ID: 10689953
After enabling the iconv extension in php.ini (I got call to undefined function), my page wouldn't refresh using the recode_string or recode functions. It just took forever loading.

I would look at the iconv function but I went to that php.net page, and I really don't have a clue what it's going on about. I'm a bit confused about the recode function too.

Please bare with me, this is new stuff for me :-)
0
SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

 

Author Comment

by:edwinbrains
ID: 10693862
Any ideas on how I can determine if a string only contains letters of the alphatbet (both uppercase and lowercase), numbers, equal signs (=) forward slashes (/) and no spaces? Please guys...
0
 
LVL 3

Expert Comment

by:JtR
ID: 10694497
yeah, you need to build an regulary expression for this! (using eregi()-function to check!)
0
 

Author Comment

by:edwinbrains
ID: 10694966
Yeah, but can someone tell me exactly how to use it? I have no idea what pattern to use, and it looks too daunting to learn.
0
 
LVL 3

Accepted Solution

by:
JtR earned 100 total points
ID: 10695409
if ( eregi( "^([A-Za-z0-9=/]*)$", $str ) )
echo "is Base64";
else echo "is not Base64";
0
 
LVL 3

Expert Comment

by:JtR
ID: 10695411
this should match any of the combination you told! $str is the string you want to check!
0
 

Author Comment

by:edwinbrains
ID: 10695623
That's exactly what I wanted - thanks :-)
0

Featured Post

SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

Question has a verified solution.

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

Part of the Global Positioning System A geocode (https://developers.google.com/maps/documentation/geocoding/) is the major subset of a GPS coordinate (http://en.wikipedia.org/wiki/Global_Positioning_System), the other parts being the altitude and t…
This article discusses how to implement server side field validation and display customized error messages to the client.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
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…

691 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