CODEWITHSUNDEEP
phpfilestring
Student
Student

Reputation: 1863

Remove a particular sub-string from string

I have following text after reading a file:

06/16/2011 04:01:05 AM : Process Start
06/16/2011 04:01:05 AM : Creating File
06/16/2011 04:01:05 AM : Opening File
06/16/2011 04:01:05 AM : Writing Text
06/16/2011 04:01:05 AM : Closing File
06/16/2011 04:01:05 AM : Sending File in email
06/16/2011 04:01:05 AM : Process End

I want to remove date and time in the beginning of each line like this:

Process Start
Creating File
Opening File
Writing Text
Closing File
Sending File in email
Process End

How can we do this with string matching technique ?

Thanks

Upvotes: 2

Views: 220

Answers (6)

questioner
questioner

Reputation: 1182

$str = "text : to : remove :  text to keep";
$pos = strrpos($str, ":");
$str2 = substr($str, $pos+1);
echo $str2;

edit: changed strpos to strrpos, to find the last occurrence, as per comment below

Upvotes: 1

Kokos
Kokos

Reputation: 9121

One way to do this would be the following: (assuming the prefix is always the same length)

$output = '';
$tmp    = explode("\n",$input);

foreach($tmp as $t)
    $output .= substr($t,25)."\n";

echo $output;

First you explode the input into a variable by splitting it on every new line, and then for each line you remove the first 25 characters to create a new output.

http://codepad.org/ewuecNuU

Upvotes: 5

Karolis
Karolis

Reputation: 9572

According to your example it seems that the best thing is to use substr() because the size of the prefix is always the same. But if you really need a matching technique it will look something like this:

$new_line = preg_replace('^/\d{2}\/\d{2}\/\d{4}\/ \d{2}:\d{2}:\d{2}\/ (?:AM|PM) : /', '', $line);

Upvotes: 2

Stuck
Stuck

Reputation: 12292

echo preg_replace('/(.*): /', '', $input);

Upvotes: 1

Miki
Miki

Reputation: 7188

If all strings are prefixed with text of the same length, use substring. If not, use regular expression matching.

Upvotes: 2

IvanGL
IvanGL

Reputation: 767

Date and time have constant length in your file. Use substr function to cut off 25 symbols from start of each line.

Upvotes: 2

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