Split string after matching the word in shell - arrays

Question

I have a csv file in that values are like:
Wt-Do-U-Do-Wit-The-Black,black
Yay-Its-Your-Birthday-Black,black
You-Are-My-Sunshine-Happy-Birthday-Red,red
You-Are-Special-Navy-Blue,navy-blue
You-Dont-Look-A-Day-Over-Fabulous-Green,green
You-My-Friend-Are-Ridiculously-Fabulous-Happy-Birthday-Pink,pink
I want to split each string before colour name comes.For Ex:
str1=Wt-Do-U-Do-Wit-The
str1=Yay-Its-Your-Birthday
str1=You-Are-My-Sunshine-Happy-Birthday
str1=You-Are-Special
str1=You-Dont-Look-A-Day-Over-Fabulous
str1=You-My-Friend-Are-Fabulous-Happy-Birthday
For searching the string i am using :-
if [ "$string" == *"Black"* ] && [ "$string" == *"White"* ] ; then
echo "It's there!"
else
echo "SOrry"
fi
It is searching fine. But how can I split the string?
Another way I used :
colour_arr[0]='Red'
colour_arr[1]='Black'
colour_arr[2]='Navy-Blue'
colour_arr[3]='White'
inarray=$(echo ${colour_arr[#]} | grep -o "$string" | wc -w)
echo "$inarray"
But this is not working.

Answer 1

you can use sed; inspired from this answer
I simplified the problem a little since you parsed the strings already correctly; using this input file:
This is red colour
Ball is black colour
some more words before red and more after
for the second part of the string; starting with the color name:
sed -n -e 's/^.*\(\(red\|black\).*\)/\1/p' test
gives:
red colour
black colour
red and more after
and
sed -n -e 's/\(^.*\)\(\(red\|black\).*\)/\1/p' test
gives:
This is
Ball is
some more words before
I won't explain all the options; since they are well explained in the answer I referred to. You can use sed on a bash variable using:
leftpart=$(sed -n -e 's/\(^.*\)\(\(red\|black\).*\)/\1/p' <<< $INPUT_STRING)
EDIT after the OP changed the input format:
my answer still applies; just replace red with Red. The rest applies the same.

Answer 2

For your new input
Input
$ cat f2
Wt-Do-U-Do-Wit-The-Black,black
Yay-Its-Your-Birthday-Black,black
You-Are-My-Sunshine-Happy-Birthday-Red,red S
You-Are-Special-Navy-Blue,navy-blue
You-Dont-Look-A-Day-Over-Fabulous-Green,green
You-My-Friend-Are-Ridiculously-Fabulous-Happy-Birthday-Pink,pink
Output ( Using gawk )
$ awk 'BEGIN{IGNORECASE=1;FS="[ ,]";OFS=","}match($1,$2){print "str1="substr($1,1,RSTART-2)}' f2
str1=Wt-Do-U-Do-Wit-The
str1=Yay-Its-Your-Birthday
str1=You-Are-My-Sunshine-Happy-Birthday
str1=You-Are-Special
str1=You-Dont-Look-A-Day-Over-Fabulous
str1=You-My-Friend-Are-Ridiculously-Fabulous-Happy-Birthday
For your old input
Input
$ cat f
"This is red colour",red
"Ball is black colour",black
"Tshirt is white colour",white
"Shoes are blue colour",blue
"This is green colour",green
Output
$ awk 'BEGIN{FS=OFS=","}{gsub(/"/,"");match($1,$2);print "str1="substr($1,1,RSTART-1),"str2=" substr($1,RSTART) }' f
str1=This is ,str2=red colour
str1=Ball is ,str2=black colour
str1=Tshirt is ,str2=white colour
str1=Shoes are ,str2=blue colour
str1=This is ,str2=green colour

Answer 3

OneLiner using awk (gnu for IGNORECASE)
awk -F ',' 'BEGIN{IGNORECASE=1}{sub("-"$NF"$","",$1);print "str1="$1}' YourFile
Self commented code
awk -F ',' '# sepeartor of field is coma
# before first line
BEGIN{
# define case compair behaviour (ignoring the case)
IGNORECASE=1
}
# for each line
{
# substitute the pattern ( minus than field 2 content, so the color, at the end) in fields 1 by "" (remove)
sub( "-" $NF "$", "", $1)
# print the new content of filed 1 with str1= before
print "str1="$1
}' YourFile

Answer 4

Based on your comments, you need color out of first "dashed" field , not the value of the second field (comma separated).
If color in this first "dashed" field is always the last string (dash separated), you can simply use
a="You-Are-My-Sunshine-Happy-Birthday-Red" ; awk -F- '{print $NF}' <<<"$a"
PS: You can isolate the first field of the whole line with cut or awk:
awk -f, '{print $1}' <<<"$fileline" or cut -d, -f1 <<<"$fileline"
You can combine above two to achieve what you need.

Answer 5

Keep it simple:
$< input.txt
Wt-Do-U-Do-Wit-The-Black,black
Yay-Its-Your-Birthday-Black,black
You-Are-My-Sunshine-Happy-Birthday-Red,red
You-Are-Special-Navy-Blue,navy-blue
You-Dont-Look-A-Day-Over-Fabulous-Green,green
You-My-Friend-Are-Ridiculously-Fabulous-Happy-Birthday-Pink,pink
$sed -E 's/(-[^-]+)(,.*)/\2/g' input.txt
Wt-Do-U-Do-Wit-The,black
Yay-Its-Your-Birthday,black
You-Are-My-Sunshine-Happy-Birthday,red
You-Are-Special-Navy,navy-blue
You-Dont-Look-A-Day-Over-Fabulous,green
You-My-Friend-Are-Ridiculously-Fabulous-Happy-Birthday,pink
(Note: on my OS, OSX, sed -E is for extended regex.)