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Runtime hash array & text processing

Posted on 2002-05-23
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Last Modified: 2013-12-25
Hi

Please tell me how to fill contents into a hash array dynamically. The hash array is empty initially and it is to be filled with key value pairs (say employee no-employee name from database )so that I can process it later.

 My another problem is I would like to get the index of a particular particular character in a string. For example I want to capitalise the first letter in 'abcd.com'. Here I want to capitalise 'a' but I would like to know the way of getting character/text indexes in a string .

Thanks in advance
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Question by:boolee
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Expert Comment

by:ozo
ID: 7030685
$hash{$employee_name} = $employee_no;

$string = ucfirst 'abcd.com';
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by:boolee
ID: 7031431
HI ozo

Thanks. The hash array worked fine and I could capitalise the first letter also. But I would like to know the way of getting character/substring indexes in  strings in perl.  I know the perl regular expressions are very powerful and it can do all kinds test processing.   But still I am looking for this because I was doing my works in java and C where I could replace the character or string at a particular index.  Am i asking something that is not relevant in perl?
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Author Comment

by:boolee
ID: 7031481
HI ozo

Thanks. The hash array worked fine and I could capitalise the first letter also. But I would like to know the way of getting character/substring indexes in  strings in perl.  I know the perl regular expressions are very powerful and it can do all kinds test processing.   But still I am looking for this because I was doing my works in java and C where I could replace the character or string at a particular index.  Am i asking something that is not relevant in perl?
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LVL 84

Expert Comment

by:ozo
ID: 7033295
substr($string,5,1) =~ s/(.)/\U$1/;
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Author Comment

by:boolee
ID: 7036527
HI ozo

would u please explain me the the code

"substr($string,5,1) =~ s/(.)/\U$1/; "
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Expert Comment

by:ozo
ID: 7038435
Capitalize the fifth letter in $string
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Author Comment

by:boolee
ID: 7041002
Ozo

u did it in reverse... How do I know it is the fifth character? any buit in function? For example I want to know the index of second 'e' in 'aebcdefg'...
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LVL 84

Expert Comment

by:ozo
ID: 7041041
'aebcdefg' =~ /e[^e]*(e)/;
print $-[1];

# or

($_ = 'aebcdefg') =~ /e[^e]*e/g;
print ((pos)-1);

# to capitalize the second e

($_ = 'aebcdefg') =~ s/(e[^e]*)(e)/$1\u$2/;


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Accepted Solution

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ozo earned 50 total points
ID: 7041052
($_ = 'aebcdefg') =~ /e[^e]*/g;
print pos;

#or

print index($_,"e",index($_ = 'aebcdefg',"e")+1);


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Author Comment

by:boolee
ID: 7041570
OK ozo...Its working.......Tell u something... pls add some explanatory comments when u post ur answers... it will be of great help... Thanks.

boolee
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