if (stri_install_check(silent=TRUE))
stri_extract_all_charclass(c('AbcdeFgHijK', 'abc', 'ABC'), '\\p{Ll}')
if (stri_install_check(silent=TRUE))
stri_extract_all_charclass(c('AbcdeFgHijK', 'abc', 'ABC'), '\\p{Ll}', merge=FALSE)
if (stri_install_check(silent=TRUE))
stri_extract_first_charclass('AaBbCc', '\\p{Ll}')
if (stri_install_check(silent=TRUE))
stri_extract_last_charclass('AaBbCc', '\\p{Ll}')
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