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How to use gsub and array

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# 1  
Old 01-28-2012
How to use gsub and array
Hello,
i'm searching for a solution to this problem.
I have 2 files, the first one is like:

Code:
<HTML>
<HEAD>
<TITLE>{$String1}</TITLE>
</HEAD>
<BODY>
<P>{$String2}</P>
</BODY>
</HTML>

and the other one:
Code:

{$String1}; french
{$String2}; italian
{$String3}; english
...
{$StringN};

I have to substitute in the html file all the
{$String1} with the right word from the second file
Code:
BEGIN{    FS=";";
    while ((getline < "language.txt")>0){
            array[$1]=$2;
    }
}
{
    gsub(/$string[0-9]/, array[&]);   
    print
}

but this operation fail

Code:
awk: 12: unexpected character '&'

anyone can solve ?

thank you in advance
# 2  
Old 01-28-2012
Your dollar sign in {$String1} has to be escaped otherwise they will think it is the end anchor in the regular expression.

Also, I don't think there is a way to back reference in awk, unlike sed

Anyway, herer is my attempt with the following assumptions:
  • one occurrence of {$String1} in each line
  • there is a max of 9 languages, ie String1 to String9
Code:
awk '
NR==FNR {
	n=split($0, a, "[; ]")
	array[a[1]]=a[n]
	next
}
/{\$String[0-9]}/ {
	start=index($0, "{$String")
	string=substr($0, start, 10)
	re=string
	gsub("\$", "\\$", re)
	gsub(re, array[string])
	print
	next
}
{
	print
}' language.txt inputfile

# 3  
Old 01-29-2012
Quote:
Originally Posted by chihung
Your dollar sign in {$String1} has to be escaped otherwise they will think it is the end anchor in the regular expression.
Sure, you are right, ty.

Quote:
Also, I don't think there is a way to back reference in awk, unlike sed
So, i cant scann the array trying to find match with the regex before?
I dont understand this point, could you explain please in an other way?
# 4  
Old 01-29-2012
Try this...
Code:
awk -F"[; ]" 'NR==FNR{sub(/\$/,"\\$",$1);a[$1]=$3;next} {for(i in a){gsub(i,a[i])}print}' file2 file1

file1 - html file
file2 - language file

--ahamed
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