Replaces a piece of the specified text with new text.
replaceb( old_text, start_num, num_chars, new_text )
old_text: (Text) The original text before replacement.
start_num: (Number) The positional index in bytes of the first byte of the substring to be replaced.
num_chars: (Number) The length in bytes of the substring to be replaced.
new_text: (Text) The text that will be inserted into the old text in place of the extricated substring.
The first byte of the entire text value is considered to have an index = 1.
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