Solved

Check string matches pattern

Posted on 2004-03-26
9
345 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
  • 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
 

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
Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

 
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

6 Surprising Benefits of Threat Intelligence

All sorts of threat intelligence is available on the web. Intelligence you can learn from, and use to anticipate and prepare for future attacks.

Join & Write a Comment

Suggested Solutions

Things That Drive Us Nuts Have you noticed the use of the reCaptcha feature at EE and other web sites?  It wants you to read and retype something that looks like this.Insanity!  It's not EE's fault - that's just the way reCaptcha works.  But it is …
This article discusses four methods for overlaying images in a container on a web page
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.
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 …

706 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now