Currently (in PHP) I have the following regex pattern:
\[(.*) (.*)=(.*)\]
This matches [doSomething limitation=true]
The end result being that my code will interpret that string and replace it with whatever value is coded to return for it.
However, some of my code needs multiple variables sent through to the function, for example:
[doSomething limitation=true otherlimitation=false sendfile=1 title="hello there"]
How can I make the (.)=(.) in the regex repeatable so that it matches every variable sent through including the first (most important) name of function?
The following may work for you:
\[(.*) ((.*)=(.*))+\]
You may also want to replace your asterisks with plus-signs. Currently, your regex would match [ =] as a valid string.
\[(.+) ((.+)=(.+))+\]
Related
I have a web script that creates a HTML page into a PHP string, then delivers it to the user. All of the pages are generated by index.php, with a unique url.
domain.host.com/index.php?loadpage=/BLAH
The homepage is static HTML, but every other page is dynamically generated into this PHP string. It may seem like im rambling, just trying to give as much info as possible. I have created a javascript code to modify the link url:
BLAH Link
This basically shows the nice neat link in the status bar, but the javascript sends it to the URL i want (I have no need to modify the url bar, as this is in an iframe)
These links are fine on the static page. But on the dynamically generated page thats in the PHP string is a little harder. I need to search through a string for every occurence of:
href="?loadpage=/ [WILDCARD] " title=
and replace it with:
href="http://domain.com/ [WILDCARD] " onclick="location.href='?loadpage=/ [WILDCARD] '; return false;" title=
This seems very complicated to me and I think it could be ereg / preg match / replace, but have no clue with regex.
In a short summary, I need some way of searching through a php string that contains the full page html, and replacing the first string with the second (on every occurance of a link with '?loadpage/'. But each link will have a different [WILDCARD] so i'm presuming, that the script will need to find every occurance, save the [WILDCARD] to a variable, then do the replace function, and insert the word its just saved as a variable from the first url.
EDIT.
Just to clarify what the original link looks like:
<a id="random" href="?loadpage=/BLAH" title="BLAH Title"></a>
this is why i am only searching from the href attribute.
You are right, what you need is a regex. (Your need for a wildcard replace is the clue). This answer is not supposed to be a complete solution, just give you an idea how regexes work. I will leave it to you to integrate this with php (try preg_match_all)
This is the pattern you want to match:
"\?loadpage=\/([^"]*)"
The \ is an escape for characters that have special meaing in regexes
So ignoring the escapes this is
"?loadpage=/ //the start of the string up to the wildcard part
() // capturing parentheses, indicating a part that
// you want to access in the replace string
[^"]* // any number of occurences of any character that is NOT doublequote
// ^ is the negation symbol
// * indicates "zero or more occurrences"
followed by...
" doublequote character
Now you need a replacement string ... for this you just need to know that your (capture parentheses) allow you to recall that part of the match. In most regex flavours your can capture these to a series numbered variables, usually represented as $1, $2, $3.. \1 \2 \3... In your case you only have one capture variable to deal with.
So you replacement string could look like
"http://domain.com/$1/" onclick="location.href='?loadpage=/$1'; return false"
In perl you would put the whole thing together like this:
$string =~ s|"\?loadpage=\/([^"]*)"|"http://domain.com/$1/" onclick=\"location.href='?loadpage=/$1'\; return false"|g;
Note that you don't need to escape your quotemarks. This may differ in php.
As you will see it easily gets very cryptic. regular-expressions.info is a useful online reference.
just so you know what you are looking at (you won't need to do this in php)...
=~ is the perl regex operator (you won't use this in php, take a look at the preg_match documentation)
then you have the form
s|match_pattern|replace_pattern|g;
where s indicates replacement (as opposed to simple matching)
g indicates global matching (otherwise process will stop on first match)
||| are the separators. Usually written /// but then you would have to escape all of your URL //s, which doubles the illegibility.
But this is now too much perl-specifc detail, read the php regex docs!
I have created a Regular Expression (using php) below; which must match ALL terms within the given string that contains only a-z0-9, ., _ and -.
My expression is: '~(?:\(|\s{0,},\s{0,})([a-z0-9._-]+)(?:\s{0,},\s{0,}|\))$~i'.
My target string is: ('word', word.2, a_word, another-word).
Expected terms in the results are: word.2, a_word, another-word.
I am currently getting: another-word.
My Goal
I am detecting a MySQL function from my target string, this works fine. I then want all of the fields from within that target string. It's for my own ORM.
I suppose there could be a situation where by further parenthesis are included inside this expression.
From what I can tell, you have a list of comma-separated terms and wish to find only the ones which satisfy [a-z0-9._\-]+. If so, this should be correct (it returns the correct results for your example at least):
'~(?<=[,(])\\s*([a-z0-9._-]+)\\s*(?=[,)])~i'
The main issues were:
$ at the end, which was anchoring the query to the end of the string
When matching all you continue from the end of the previous match - this means that if you match a comma/close parenthesis at the end of one match it's not there at match at the beginning of the next one. I've solved this with a lookbehind ((?<=...) and a lookahead ((?=...)
Your backslashes need to be double escaped since the first one may be stripped by PHP when parsing the string.
EDIT: Since you said in a comment that some of the terms may be strings that contain commas you will first want to run your input through this:
$input = preg_replace('~(\'([^\']+|(?<=\\\\)\')+\'|"([^"]+|(?<=\\\\)")+")~', '"STRING"', $input);
which should replace all strings with '"STRING"', which will work fine for matching the other regex.
Maybe using of regex is overkill. In this kind of text you can just remove parenthesis and explode string by comma.
I have a document with the following format:
<scheme attr1="lorem" attr2="ipsum" global-test="text goes here" global-attr2="second text goes here">
</scheme>
I want to use a regular expression to extract all the attributes that match global-(.*).
It can also only match on the "scheme" element, so using a simple regular expression like (global-([^=]*)="([^"]*)")+ is not an option. I tried the following regular expression:
<scheme.*([\s]+global-([^=]*)="([^"]*)")+
But this will only match on "global-attr2", and will see the other global attributes as part of the .* selector. Making the * selector on .* lazy also doesn't seem to help.
And I know that getting data from an XML document with regular expressions isn't a good practice, but this script is for a preprocessor. It modifies the XML before parsing it.
A preg_match_all will match everything and store everything as well. So first match against "<scheme", and if it matches, then run preg_match_all Match against something like
/global-(.*?)=(\w+)/
and then extract from matches[0], matches[1], etc.
I believe that the (...)+ construct does not work as you expect it. It will clobber your previous matches and only save the last one, instead of extending the match group array.
Try matching something against (.)* and see if it's true for your php setup.
I tried
<scheme(.*?[\s]+global-([^=]*)="([^"]*)")+
which I believe should work if (...)+ behaved differently.
This may be a quick question for experienced regular expressionists, but I'm having trouble getting my match to execute correctly.
Suppose I had a string that looked like this:
http://aaa-bbbb-cc-ddddd-eee-.sub.dom
I would like to go capture all of the "aaa", "bbbb", "cc", and "ddddd" substrings, but I'm not sure how many there will be (e.g., having all triplets up through "zzz").
This is the regular expression I'm trying to use right now:
/http:\/\/(\w*?\-)+\.sub\.dom/
I wrote it this way because:
I want to match substrings, but I want each to terminate when a - is parsed
I want to capture one or more of these substrings
But it seems to only be saving the last match that it makes (in the above case, it would only match "eee-".
Is there a good way to capture all of the matched substrings?
More information: I'm using PHP's PCRE function preg_replace_callback. Thanks!
No, it is not possible to match an unknown number of capture groups.
If you try to repeat a capture group, it will always contain the last value captured.
Could you explain a bit more broadly what you're trying to do? Perhaps there is another simple way to do it (possibly without regular expressions).
If you want the items in the subdomain, and then all matches between the dashes... This should work:
$string = "http://aaa-bbbb-cc-ddddd-eee-.sub.dom";
preg_match("/^http:\/\/([\w-]+?)\..*$/i", $string, $match);
$parts = explode('-', $match[1]);
print_r($parts);
Short of that you will probably have to build a small parsing script to parse the string yourself if that doesn't do it for you.
I'm trying to write a (I think) pretty simple RegEx with PHP but it's not working.
Basically I have a block defined like this:
%%%%blockname%%%%
stuff goes here
%%%%/blockname%%%%
I'm not any good at RegEx, but this is what I tried:
preg_match_all('/^%%%%(.*?)%%%%(.*?)%%%%\/(.*?)%%%%$/i',$input,$matches);
It returns an array with 4 empty entries.
I guess it also, apart from actually working, needs some sort of pointer for the third match because it should be equal to the first one?
Please enlighten me :)
You need to allow the dot to match newlines, and to allow ^ and $ to match at the start and end of lines (not just the entire string):
preg_match_all('/^%%%%(.*?)%%%%(.*?)%%%%\/(.*?)%%%%$/sm',$input,$matches);
The s (single-line) option makes the dot match any character including newlines.
The m (multi-line) option allows ^ and $ to match at the start and end of lines.
The i option is unnecessary in your regex since there are no case-sensitive characters in it.
Then, to answer the second part of your question: If blockname is the same in both cases, then you can make that explicit by using a backreference to the first capturing group:
preg_match_all('/^%%%%(.*?)%%%%(.*?)%%%%\/\1%%%%$/sm',$input,$matches);
I'm pretty sure you can't since these operations would need to save a variable and you can't in regex. You should try to do this using PHP's built-in token parser. http://php.net/manual/en/function.token-get-all.php