mtext_spn - Search an M-text for a set of characters.
Search an M-text for a set of characters.
The mtext_spn() function returns the length of the initial segment of M-text mt1
that consists entirely of characters in M-text mt2 .
Copyright (C) 2001 Information-technology Promotion Agency (IPA)
Copyright (C) 2001-2009 National Institute of Advanced Industrial Science and
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