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ruby/doc/strscan/methods/get_pos.md

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call-seq: pos -> byte_position

Returns the integer [byte position][2], which may be different from the [character position][7]:

scanner = StringScanner.new(HIRAGANA_TEXT)
scanner.string  # => "こんにちは"
scanner.pos     # => 0
scanner.getch   # => "こ" # 3-byte character.
scanner.charpos # => 1
scanner.pos     # => 3