% echo á | grep '[[=a=]]' % echo ô | grep '[[=o=]]' % On Linux to compare: $ echo á | grep '[[=a=]]' á $ echo ô | grep '[[=o=]]' ô $ See the IEEE Std: «9.3.5 RE Bracket Expression ...It consists of one or more expressions: collating elements, collating symbols, equivalence classes...» http://pubs.opengroup.org/onlinepubs/009696899/basedefs/xbd_chap09.html
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