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From: | Dan Douglas |
Subject: | Re: [Help-bash] What are the regex spec for function names? |
Date: | Sat, 8 Dec 2018 09:42:59 -0600 |
There is probably no easy regex to match strings bash will tolerate as a function name without error. The accepted names vary in several contexts. http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_05 "The function is named fname; the application shall ensure that it is a name (see XBD Name) and that it is not the name of a special built-in utility. An implementation may allow other characters in a function name as an extension." http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_235 So: ^[_[:alpha:]][_[:alnum:]]+$ is close enough for most purposes. There is no easy regex to filter the set of special builtin names.
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