The DecodeEntities(s) command converts HTML entities in the input string s to UTF-8 characters.

The conversion recognizes named entities like "π" as well as hex and decimal Unicode entities like "π" and "&#960".

$\mathrm{with}\left(\mathrm{StringTools}\right)\:$

$r≔\mathrm{DecodeEntities}\left(''\pi \; +\; \pi \; +\; \pi ''\right)$

$r≔''\pi \; +\; \pi \; +\; \pi ''$

$\mathrm{convert}\left(r\,\mathrm{bytes}\right)$

$\left[207\,128\,32\,43\,32\,207\,128\,32\,43\,32\,207\,128\right]$

$r≔\mathrm{DecodeEntities}\left(''エンコード''\right)$

$r≔''エンコード''$

$r≔\mathrm{EncodeEntities}\left(r\right)\:$$\mathrm{lprint}\left(r\right)$

"エンコード"

$\mathrm{pichar}≔\mathrm{DecodeEntities}\left(''\pi ''\right)$

$\mathrm{pichar}≔''\pi ''$

$r≔\mathrm{EncodeEntities}\left(\mathrm{cat}\left(''Is''\,\mathrm{pichar}\,''>\; 3.14''\right)\right)\:$$\mathrm{lprint}\left(r\right)$

"Is π > 3.14"

The StringTools[DecodeEntities] command was introduced in Maple 2018.

For more information on Maple 2018 changes, see Updates in Maple 2018.