BASH remove leading and trailing spaces in array - arrays

Question

I've got data coming from mysql and some values have leading or trailing spaces.
This is the code I have:
IFS=$':' res=(${vals//$'\t'/:})
for (( i=0 ; i<${#res[#]} ; i++ )); do
echo "$i: ${res[i]}*"
done
is there a simple effective way to ensure there are no leading or trailing space in res[i] ?
Thanks
EDIT
This is the result of my MYSQL query before it goes through IFS.
ZnbMF0 9RrO7 1 SiteA password password 12 1234 1234 456 456 0 0 0 0 0 0 0 0 test#domain.com test user 5 2222 0 0 0 0 server address 0 0 test#domain.com 0 0 0 0 0 0 0 0 0 0 0 0 0 NULL
In MySQL the email addresses have leading and trailing spaces.
Processing through IFS and then Looping though it as :
for (( i=0 ; i<${#res[#]} ; i++ )); do
echo "$i: ${res[i]}*"
done
Results in:
0: ZnbMFO*
1: 9RrO7*
2: 1*
3: SiteA*
4: password*
5: password*
6: 12*
7: 1234*
8: 1234*
9: 456*
10: 456*
11: 0*
12: 0*
13: 0*
14: 0*
15: 0 *
16: 0*
17: 0*
18: 0*
19: test#domain.com *
20: test*
21: user*
22: 5*
23: 2222 *
24: 0*
25: 0 *
26: 0*
27: 0*
28: server*
29: address*
30: 0*
31: 0*
32: test#domain.com *
33: 0*
34: 0*
35: 0*
36: 0*
37: 0*
38: 0*
39: 0 *
40: 0*
41: 0*
42: 0*
43: 0 *
44: 0*
45: 0*
46: NULL*
The * is there just to highlight the trailing space.
Thanks

Answer 1

Let's say you have an array as this one:
arr=('foo bar' 'test#domain.com ' \
' test#domain.com ' ' test#domain.com ')
To check array content using printf:
printf '[%s]\n' "${arr[#]}"
This will show:
[foo bar]
[test#domain.com ]
[ test#domain.com ]
[ test#domain.com ]
Now for leading and trailing space removal:
shopt -s extglob # turn on extended glob
arr=( "${arr[#]/#+([[:blank:]])/}" ) # remove leading space/tab from each element
arr=( "${arr[#]/%+([[:blank:]])/}" ) # remove trailing space/tab from each element
Now if you print array again:
printf '[%s]\n' "${arr[#]}"
It will show:
[foo bar]
[test#domain.com]
[test#domain.com]
[test#domain.com]

Answer 2

Not sure if you would call it simple, but you can use sed:
echo "${res[i]}" | sed 's/^ *\| *$//g'
vals=$' a \t c d'
IFS=$':' res=(${vals//$'\t'/:})
for (( i=0 ; i<${#res[#]} ; i++ )); do
echo X${res[i]}X
res[$i]=$(echo "${res[i]}" | sed 's/^ *\| *$//g')
echo X${res[i]}X
done
Output:
X a X
XaX
X c dX
Xc dX