如何做一个重音不敏感的grep？

_{(道歉双张贴,但这绝对是一个明显的答案. 这也是正确的答案.我只是刚刚学会的这几分钟前.)}

您正在寻找一大堆POSIX正则表达式等价类:

14.3.6.2等价类运算符([= … =])

正则表达式识别列表中的等价类表达式.甲等价类表达是一组核对这都属于同一等价类别的元素.通过在open-equivalence-class操作符和close-equivalence-class操作符之间放置一个collat​​ing元素,可以形成一个等价类表达式.[=表示open-equivalence-class运算符,=]表示close-equivalence-class运算符.例如,如果a和A是一个等价类,那么这两个[[=a=]]和[[=A=]]将匹配都a和A.如果等价类表达式中的整理元素不是等价类的一部分,则匹配器会将等价类表达式视为整理符号.

我在下一行使用插入符号来指示实际着色的内容.我还调整了测试字符串来说明关于案例的观点.

$ echo "I match àei but also ä?ì and possibly æi" | grep '[[=a=]][[=e=]][[=i=]]'
I match àei but also ä?ì and possibly æi
        ^^^          ^^^

$ echo "I match àei but also ä?ì and possibly æi" | grep '[[=a=][=e=][=i=]]'
I match àei but also ä?ì and possibly æi
^  ^    ^^^     ^    ^^^ ^       ^     ^

$ echo "I match àei but also ä?ì and possibly æi" \
    | grep -P '[[=a=][=e=][=i=]](?<![aei])'
grep: POSIX collating elements are not supported

$ echo "I match àei but also ä?ì and possibly æi" \
    | perl -ne 'print if /[[=a=][=e=][=i=]](?<![aei])/'
POSIX syntax [= =] is reserved for future extensions in regex; marked by <-- HERE in m/[[=a=][=e= <-- HERE ][=i=]](?<![aei])/ at -e line 1.

$ echo "I match àei but also ä?ì and possibly æi" \
    | python -c 'import re, sys;
                 print re.findall(r"[[=a=][=e=][=i=]]", sys.stdin.read())'
[]

$ echo "I match àei but also ä?ì and possibly æi" \
    | grep --color=always '[[=a=][=e=][=i=]]' \
    | perl -pne "s/\e\[[0-9;]*m\e\[K(?i)([aei])/\$1/g"
I match àei but also ä?ì and possibly æi
        ^            ^^^