Referencia de expresiones regulares en bash:
http://wiki.bash-hackers.org/syntax/pattern
http://www.regular-expressions.info/posixbrackets.html
https://www.gnu.org/software/bash/manual/html_node/Pattern-Matching.html
http://www.computerworld.com/article/2693361/unix-tip-using-bash-s-regular-expressions.html
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