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using shell parameter expansion,
mapfile countries echo ${countries##*[Aa]*}
${parameter##pattern} deletes longest matching pattern.
${parameter##pattern}
If you need further information, here is bash reference manual. https://www.gnu.org/software/bash/manual/bash.html#Shell-Parameter-Expansion
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Filter an Array with Patterns
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using shell parameter expansion,
${parameter##pattern}deletes longest matching pattern.If you need further information, here is bash reference manual. https://www.gnu.org/software/bash/manual/bash.html#Shell-Parameter-Expansion