Em dash:

• use utf8; /—/ (source saved as UTF-8)
• /\x{2014}/
• /\N{U+2014}/
• use charnames ':full'; /\N{EM DASH}/

En dash:

• use utf8; /–/ (source saved as UTF-8)
• /\x{2013}/
• /\N{U+2013}/
• use charnames ':full'; /\N{EN DASH}/

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