php Pattern Matching for custom tags

Question

I am trying to replace all the tags in a file like {{name:something}} to some certain values. Note that in {{name::something}} only something might warry. Like {{name:title}} or {{name:content}}. That "name" will always be there.

Anyway, I used preg_match_all and preg_replace, it all worked out. I found the matches with this regular expression: $patmatch="/{{name:[a-zA-Z0-9._-]+}}/";

My problem is the following:

When a tag like this does not match the pattern (it has a syntax error), like {{notname:something}} or {{name something}} or {{ }} i must throw an exception. How do i know if the tag is there, but with a syntax error?

Can i somehow make another pattern search to check if it's a tag (between {{ and }}) and if it's not like {{name:something}}?

Any help would be appreciated, Thanks!

NFLineast · Accepted Answer · 2012-03-25 17:34:41Z

1

Off the top of my head:

if(strpos($text, '{{name:') === false)
{
    //exception
}
else
{
    //properly formatted text
}

Something like that?

answered Mar 25, 2012 at 17:34

NFLineast

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3 Comments

Darksody Over a year ago

Well, almost. You see, the preg_match_all() function will get me only the right matches. The properly formatted texts. But i need to also find the incorrect ones and throw an exception if i find any.

Darksody Over a year ago

Thank you all, i solved the problem with NFLineast's ideea. I just preg_match_all() on every $patmatch="/{{[a-zA-Z0-9.:_-]+}}/"; (basically every {{ }} ) and then i just check if(strpos($text, '{{name:') === false) as NFLineast said. Thanks again, all of your solutions are good, i will try the others aswell i think :) Darksody.

NFLineast Over a year ago

Excellent. strpos() is also a lot less resource hungry than preg_match()... :)

Kyborek · Accepted Answer · 2012-03-25 18:03:43Z

1

Other answers only check if that tag is inside content, this one checks for true validity:

Assuming that you have $content variable that holds contents of file, you can temporarily store validation data which will be like that:

$validation = preg_replace("/{{name:[a-zA-Z0-9._-]+}}/","",$content);

So you will have cotents stripped off valid tags and now you want to look for invalid tag, depending on how strict you want it, you can use one of theese:

if(preg_match('/{{name:[^}]*}}/', $validation)) //found error tag
//alternatively you might want to check for typos like "nmae":
if(preg_match('/{{[^}]*}}/', $validation)) //found error tag

edited Mar 25, 2012 at 18:03

answered Mar 25, 2012 at 17:44

Kyborek

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Comments

user1291573 · Accepted Answer · 2012-03-25 17:57:45Z

0

Maybe you can use something like subpattern, naming and check the result

answered Mar 25, 2012 at 17:57

user1291573

1

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