2008/12/22 Jim Lucas <lists@xxxxxxxxx>:
> Rene Fournier wrote:
>> Hi, I'm looking for some ideas on the best way to parse blocks of text
>> that is formatted such as:
>>
>> $sometext %\r\n -- good data
>> $otherstring %\r\n -- good data
>> $andyetmoretext %\r\n -- good data
>> $finaltext -- bad data (missing ending)
>>
>> Each line should start with a $dollar sign, then some arbitrary text,
>> ends with a percent sign, followed by carriage-return and line-feed.
>> Sometimes though, the final line is not complete. In that case, I want
>> to save those lines too.
>>
>> ....so that I end up with an array like:
>>
>> $result = array ( "matches" =>
>> array ( 0 => "$sometext %\r\n",
>> 1 => "$otherstring %\r\n",
>> 2 => "$andyetmoretext %\r\n"
>> ),
>> "non_matches" =>
>> array ( 3 => "$finaltext"
>> )
>> );
>>
>> The key thing here is that the line numbers are preserved and the
>> non-matched lines are saved...
>>
>> Any ideas, what's the best way to go about this? Preg_matc, preg_split
>> or something incorporating explode?
>>
>> ....Rene
>>
>
> Something along the line of this?
>
> <pre><?php
>
> $block_of_text = '$sometext %\r\n
> $otherstring %\r\n
> $andyetmoretext %\r\n
> $finaltext';
>
> $lines = explode("\n", $block_of_text);
>
> $results = array();
>
> foreach ( $lines AS $i => $line ) {
> if ( preg_match('|^\$.* %\\\r\\\n$|', $line ) ) {
> $results['matches'][$i] = $line;
> } else {
> $results['non_matches'][$i] = $line;
> }
> }
>
> print_r($results);
>
> ?>
I know I'm arguing against premature optimization in another thread at
the moment, but using regexps for this is overkill from the get-go:
if ($line[0] === '$' && substr($line, -3) === "%\r\n") {
This is both faster and easier to read. Regexps are great for more
complex stuff but something this simple doesn't demand their power (or
overhead).
Torben
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