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Full Discussion: Matching multiple values in a string
Top Forums Shell Programming and Scripting Matching multiple values in a string Post 302483503 by linber2880 on Monday 27th of December 2010 11:14:28 AM
Old 12-27-2010
Matching multiple values in a string
I've been battling with parsing a comma-delimited string, and have had what I would call B- success. I'm using perl and trying to parse out specific identifiers from a string, into a new string. When things are "normal," my regex works fine. When things get complicated, my script fails miserably. I think a loop is in order, but often find that someone here has a more elegant way to do things.

Specifically, my script has 2 variables that I'm concerned with: $identifier and $key. $key is just an integer - it could be 7, 77, etc. $identifier is a string that contains a number of codes. I'm trying to pull out the codes that match $identifier and concatenate them in a new string.

For example, (this is one of the difficult ones),

$key = 7
$identifier = "CODES: L7,BT7-1,CP87,E7"

The desired result would be: $parsed = "L7,BT7-1,E7" since they are all of the "7" codes. 87 is a separate identifier. If it's just 7s, I'm OK. When there are other numbers containing 7, or they appear at the beginning or end, I have problems.

Any help or suggestions would be greatly appreciated. Just need something to break the mental log jam that is preventing me from seeing the obvious!

Thanks, Doug
 

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LEARN ABOUT MOJAVE

ustrtok

ustrtok(3alleg4)						  Allegro manual						  ustrtok(3alleg4)

NAME

       ustrtok - Retrieves tokens from a string. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       char *ustrtok(char *s, const char *set);

DESCRIPTION

       This  function  retrieves  tokens  from	`s'  which  are  delimited by characters from `set'. To initiate the search, pass the string to be
       searched as `s'.  For the remaining tokens, pass NULL instead. Warning: Since ustrtok alters the string it is parsing,  you  should  always
       copy  the  string  to  a temporary buffer before parsing it. Also, this function is not re-entrant (ie. you cannot parse two strings at the
       same time). Example:

	  char *word;
	  char string[]="some-words with dashes";
	  char *temp = ustrdup(string);
	  word = ustrtok(temp, " -");
	  while (word) {
	     allegro_message("Found `%s'
", word);
	     word = ustrtok(NULL, " -");
	  }
	  free(temp);

RETURN VALUE

       Returns a pointer to the token, or NULL if no more are found.

SEE ALSO

       uconvert(3alleg4), ustrchr(3alleg4), ustrrchr(3alleg4), ustrstr(3alleg4), ustrpbrk(3alleg4), ustrtok_r(3alleg4),  allegro_message(3alleg4),
       ustrncpy(3alleg4), exgui(3alleg4)

Allegro 							   version 4.4.2						  ustrtok(3alleg4)
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