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I need Exactly Unicode equivalent as U00AE.

That doesn't make any sense. Please speak in terms of HTML entities, Unicode characters, U+xxxx notation and perhaps UTF-8 encoding.

Are you asking how to get character U+00AE from "®"?
decode_entities will get the character from ®.
Are you asking how to get the string "U+00AE" from character U+00AE?
ord will get 0xAE from the character.
sprintf can be used to format 0xAE as hex.

For example,

>perl -MHTML::Entities=decode_entities -e"printf qq{U+%04X\n}, ord(dec
+ode_entities('&reg;'))"
U+00AE
[download]

But then again, you also mentioned JSON. Whatever JSON module will handle serializing the character as "\u00AE" or similar from from the character U+00AE, so all you only need is decode_entities.

In reply to Re^3: Convert HTML symbols to equivalent Unicode by ikegami
in thread Convert HTML symbols to equivalent Unicode by jai_dgl

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