The HasIdentifier(s) command determines whether s contains characters that are valid as a character in an unquoted Maple identifier.

If s contains valid characters, HasIdentifier returns true. Otherwise, false is returned.

The HasIdentifier1(s) command determines whether s contains any characters that are valid as the first character of an unquoted Maple identifier.

If s has any characters valid as the first character, HasIdentifier1 returns true. Otherwise, false is returned.

All of the StringTools package commands treat strings as (null-terminated) sequences of $8$-bit (ASCII) characters.  Thus, there is no support for multibyte character encodings, such as unicode encodings.

The StringTools[HasIdentifier] and StringTools[HasIdentifier1] commands are thread-safe as of Maple 15.

For more information on thread safety, see index/threadsafe.

$\mathrm{with}\left(\mathrm{StringTools}\right)\:$

$\mathrm{HasIdentifier}\left(''\backslash n\backslash t?''\right)$

$\mathrm{true}$

$\mathrm{HasIdentifier}\left(''foo\; bar''\right)$

$\mathrm{true}$

$\mathrm{HasIdentifier1}\left(''\backslash n\backslash t?''\right)$

$\mathrm{false}$

$\mathrm{HasIdentifier1}\left(''foo\; bar''\right)$

$\mathrm{true}$