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Get captured groups from a regex match against a string

suggest change 
a='I am a simple string with digits 1234'
pat='(.*) ([0-9]+)'
[[ "$a" =~ $pat ]]
echo "${BASH_REMATCH[0]}"
echo "${BASH_REMATCH[1]}"
echo "${BASH_REMATCH[2]}"

Output: 

I am a simple string with digits 1234
I am a simple string with digits
1234
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Pattern matching and regular expressions:
* Pattern matching and regular expressions
* Behaviour when a glob does not match anything
* Check if a string matches a regular expression
* Get captured groups from a regex match against a string
* The glob
* The glob
* Case insensitive matching
* The glob
* Extended globbing
* Regex matching
* The glob
* Matching hidden files
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