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reading from forn

Posted on 1998-11-14
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Last Modified: 2010-03-04
how can i read a string from a form and process each character by character?

for example i enter: hi

i want to be able to edit "h" and "i" individualy
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Question by:chongkong
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7 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 1206215
what do you want to do with "h" and "i"?
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Author Comment

by:chongkong
ID: 1206216
i wanted to add some prefix value for example "ab" to a string of number or character i enter and print if one on a new line

for "hi"

it would be abh and abi
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Accepted Solution

by:
JFM earned 100 total points
ID: 1206217
Hi ozo,

You could try to add your prefixes by regular expression:

$line = "hi, this is JFM";
# put any character you want within the [ ]
$line =~ s/([hi])/ab$1\n/g;
print $line;

# shows:
abh
abi
, tabh
abi
s abi
s JFM

I don't know a possibility to read each character by character. For better effeciency it would be better to read line by line (or even the whole stream) and process the line afterwards.

Hope, that helps,
JFM.
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Expert Comment

by:stepherd
ID: 1206218

Assuming your HTML form is using the post method, and (for argument) the name of the field is "text" use this:

#!/usr/local/bin/perl      

print "Content-type: text/html\n\n";

&parse_form;


@letters = split(//, $in{'text'});



sub parse_form {

   # Get the input
   read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});

   # Split the name-value pairs
   @pairs = split(/&/, $buffer);

   foreach $pair (@pairs) {
      ($name, $value) = split(/=/, $pair);

      # Un-Webify plus signs and %-encoding
      $value =~ tr/+/ /;
      $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
      $value =~ s/<!--(.|\n)*-->//g;

      $in{$name} = $value;
   }

}


This will put all the letters in your the word into the array
@letters. So, if your form submitted the word "hi", then

@letters[0] = "h"
@letters[1] = "i"




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Author Comment

by:chongkong
ID: 1206219
thanks stepherd,

its with i needed
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LVL 84

Expert Comment

by:ozo
ID: 1206220
You're thanking stepherd, but accepted JFM's answer.
Which was really what you needed?

(also, substr($in{'text'},0,1) eq "h", substr($in{'text'},1,1) eq "i",
or vec, or while( m/(.)/sg ) or pack/unpack or some other technique may be appropriate depending on what kind of editing you wish to do)
0
 

Expert Comment

by:JFM
ID: 1206221
ok, sorry for that. I was a little bit too quick, thinking I understood the problem and had the right answer. Next time, it'll be a comment.
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