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Full Discussion: Help with finding matching position on strings
Top Forums UNIX for Dummies Questions & Answers Help with finding matching position on strings Post 302507324 by bartus11 on Wednesday 23rd of March 2011 01:11:22 PM
Old 03-23-2011
-l "chomps" $_ variable, meaning it removes only last newline. To remove newlines that are inside of the input string, s// has to be used.
Code:
while(/(.*?)$x/g){

This is a bit tricky piece. It is matching sequentially on $_ variable, and when match is found, the body of while loop is executed. So for each match in a string, the code of while's body will be executed.
print ((length $1) + 1 + $sumIt will print starting position of the searched pattern. It is achieved by getting the number of characters before that string - length $1 ($1 stores match of the red part in regular expresion). To make it possible to print subsequent positions (after first match), the number of characters from the beginning of the string has to be saved. It is done by $sum.
((length $&) + $sum)This will calculate ending position of pattern to search ($& is a variable containing whole string matched by the regex, so length $& will get number of characters before searched pattern + length of that pattern.
$sum+=length $&As I wrote before, $sum is saving the number of characters that regex already passed through.
Last edited by bartus11; 03-23-2011 at 02:24 PM..
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LEARN ABOUT PHP

mb_ereg_search_pos

MB_EREG_SEARCH_POS(3)							 1						     MB_EREG_SEARCH_POS(3)

mb_ereg_search_pos - Returns position and length of a matched part of the multibyte regular expression for a predefined multibyte string

SYNOPSIS

       array mb_ereg_search_pos ([string  $pattern], [string  $option = "ms"])

DESCRIPTION

	Returns position and length of a matched part of the multibyte regular expression for a predefined multibyte string

	The string for match is specified by mb_ereg_search_init(3). If it is not specified, the previous one will be used.

PARAMETERS

	      o $pattern
		- The search pattern.

	      o $option
		- The search option.

RETURN VALUES

	An  array  containing  two elements. The first element is the offset, in bytes, where the match begins relative to the start of the search
       string, and the second element is the length in bytes of the match.

	If an error occurs, FALSE is returned.

NOTES

       Note

	      The internal encoding or the character encoding specified by mb_regex_encoding(3) will be used as the character  encoding  for  this
	      function.

SEE ALSO

       mb_regex_encoding(3), mb_ereg_search_init(3).

PHP Documentation Group 												     MB_EREG_SEARCH_POS(3)
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