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    <p>Looks to be related to ticket #1986, where it is discussed whether this is a "bug" or the Internet changing out from under its own spec:</p> <p><a href="http://curecode.org/rebol3/ticket.rsp?id=1986" rel="nofollow">Have DEHEX convert UTF-8 sequences from browsers as Unicode</a>.</p> <p>If you have specific experience on what has become standard in Chinese, and want to weigh in, that would be valuable.</p> <p>Just as an aside, the specific case above could have been handled in PARSE alternately as:</p> <pre><code>key-value: {field=%E4%BA%BA} utf8-bytes: copy #{} either parse key-value [ copy field-name to {=} skip some [ and {%} copy enhexed-byte 3 skip ( append utf8-bytes dehex enhexed-byte ) ] ] [ print [field-name {is} to string! utf8-bytes] ] [ print {Malformed input.} ] </code></pre> <p>That will output:</p> <pre><code>field is 人 </code></pre> <p>With some comments included:</p> <pre><code>key-value: {field=%E4%BA%BA} ;-- Generate empty binary value by copying an empty binary literal utf8-bytes: copy #{} either parse key-value [ ;-- grab field-name as the chars right up to the equals sign copy field-name to {=} ;-- skip the equal sign as we went up to it, without moving "past" it skip ;-- apply the enclosed rule SOME (non-zero) number of times some [ ;-- match a percent sign as the immediate next symbol, without ;-- advancing the parse position and {%} ;-- grab the next three chars, starting with %, into enhexed-byte copy enhexed-byte 3 skip ( ;-- If we get to this point in the match rule, this parenthesized ;-- expression lets us evaluate non-dialected Rebol code to ;-- append the dehexed byte to our utf8 binary append utf8-bytes dehex enhexed-byte ) ] ] [ print [field-name {is} to string! utf8-bytes] ] [ print {Malformed input.} ] </code></pre> <p><em>(Note also that "simple parse" is getting the axe in favor of <a href="http://curecode.org/rebol3/ticket.rsp?id=1886" rel="nofollow">enhancements to SPLIT</a>. So writing code like <code>parse data "="</code> can now be expressed instead as <code>split data "="</code>, or other cool variants if you check them out...samples are in the ticket.)</em></p>
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    1. POIs there a function to decode encoded unicode utf-8 string like from a form?
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    1. COThis method is more clarified. Using `load v` to construct the binary is not natural. The two links in http://curecode.org/ is great. I will read them more carefully. There is a little bug in your code, or my version does't support it? The code `{%} -1 skip` can't work in my console(Script Error: Value out of range: -1). I change it to `to {%}` and it works. At last, thank you very much for formatting and reorganization.
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    2. CO@WayneTsui No problem, sorry about the error... I must have copied that from a version I tried that I thought worked but didn't. An issue with using TO is that it would advance the parse position up TO that rule... so malformed input like `field=x123\abc%E4BA%BA` would be accepted. I'll look into how to properly skip backward, but `AND` will ensure that the rule is only fired if percent is the immediate next position without advancing...
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