tcl_wordchars is a global variable which contains a [regular expression]
that is used by routines like [tcl_endOfWord] to identify whether a
character is part of a word or not. If the pattern matches a character,
the character is considered to be a word character. On Windows
platforms, words are comprised of any character that is not a space,
tab, or newline. Under Unix, words are comprised of numbers, letters or
underscores.

See [tclvars] for other variables used by [tcl]/[tk].


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[Category Internals]