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node-red/packages/node_modules/@node-red/nodes/locales/en-US/logic/15-change.html

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<script type="text/x-red" data-help-name="change">
<p>Set, change, delete or move properties of a message, flow context or global context.</p>
<p>The node can specify multiple rules that will be applied in the order they are defined.</p>
<h3>Details</h3>
<p>The available operations are:</p>
<dl class="message-properties">
<dt>Set</dt>
<dd>set a property. The value can be a variety of different types, or
can be taken from an existing message or context property.</dd>
<dt>Change</dt>
<dd>search &amp; replace parts of the property. If regular expressions
are enabled, the "replace with" property can include capture groups, for
example <code>$1</code>. Replace will only change the type if there
is a complete match.</dd>
<dt>Delete</dt>
<dd>delete a property.</dd>
<dt>Move</dt>
<dd>move or rename a property.</dd>
</dl>
<p>The "expression" type uses the <a href="http://jsonata.org/" target="_new">JSONata</a>
query and expression language.
</p>
</script>