CODEWITHSUNDEEP
arraysregexbash
McJohnson
McJohnson

Reputation: 313

Storing matching results from a regular expression in an array

I am trying to write a simple bash script that would grep for a string in a binary file and then using a regular expression extract all hexadecimal strings. However, I cannot seem to find a way in which I could store the output from the regex in an array which I could later on use to convert all of its elements from hexadecimal to ASCII values.

str=$(grep -ra "Html.Exploit.CVE.2015_6073" /var/lib);
hexstr=$([[ $STR =~ (?<=^|[*{};])[A-Fa-f0-9]+(?=$|[*;{}]) ]]);
converted=$(xxd -r -p <<< "$HEXSTR");
echo -e "\e[92m$converted \e[0m"

Can I do an if statement with a while loop in it that would create an array with the hexadecimal strings (returned from the regex) as elements?

UPDATE

Current code:

#!/bin/bash

str=$(grep -ra "Html.Exploit.CVE.2015_6073" /var/lib);

 if [[ $str =~ (?<=^|[*{};])[A-Fa-f0-9]+(?=$|[*;{}]) ]]; then
      Array+="$str"
 fi

 for hex in "${Array[@]}"; do 
      echo $hex
 done

Upvotes: 0

Views: 115

Answers (1)

jkdba
jkdba

Reputation: 2509

You can add values to an array like this in bash:

 Array+=("$hexstr")

Then you can loop through the array like this:

 for hex in "${Array[@]}"; do 
      #perform operation to convert hex here
      converted="$(xxd -r -p <<< "$hex")"
 done

To correct the if match logic you can make a statement like this so the $hexstr variable will get set.

 if [[ $STR =~ (?<=^|[*{};])[A-Fa-f0-9]+(?=$|[*;{}]) ]]; then
      hexstr="$STR"
 fi

Putting this together would look like this:

 if [[ $STR =~ (?<=^|[*{};])[A-Fa-f0-9]+(?=$|[*;{}]) ]]; then
      Array+=("$STR")
 fi

 ###Do work
 ###Use For loop etc

If you want to shorten your code even more (less code less chances to break) you can do all of the matching in the grep and add to the array like this:

 Array=($( grep -ra "Html.Exploit.CVE.2015_6073" /var/lib | grep -oP "(?<=^|[*{};])[A-Fa-f0-9]+(?=$|[*;{}])"))
 ##Do For loop

The above will perform your grep and find only matching lines then it will get only the matching value of the regex and store each in the array.

Upvotes: 3

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