Tex: Get the first character of a string or macro

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Peter Schneider
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Get the first character of a string or macro
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(tex.stackexchange.com/users/334007/texnically-a-username)Texnically a username
(tex.stackexchange.com/users/73/joseph-wright)Joseph Wright
(tex.stackexchange.com/users/5001/mico)Mico
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strings macros



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