regex101: PCRE2 (PHP) Match Workspace

Regular Expression

<?xml version="1.0" encoding="UTF-8"?>
<mxfile host="Electron" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/29.3.0 Chrome/140.0.7339.249 Electron/38.7.2 Safari/537.36" version="29.3.0">
  <diagram name="Tangled-words" id="f82cf17d8bbfef3b8d1bc3d25e9940d1">
    <mxGraphModel dx="1213" dy="876" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="3200" pageHeight="800" math="0" shadow="0">
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />
        <mxCell id="0c4a-499e" edge="1" parent="1" source="8d67-6c83" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;fillColor=#88B888;strokeColor=#88B888;startArrow=none;startFill=0;endArrow=classic;endFill=1;" target="8342-75e8" value="">
          <mxGeometry relative="1" as="geometry" />
        </mxCell>
        <mxCell id="11bd-50cd" edge="1" parent="1" source="3d24-65d3" st

Extraction

<?xml version="1.0" encoding="UTF-8"?>
<mxfile host="Electron" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/29.3.0 Chrome/140.0.7339.249 Electron/38.7.2 Safari/537.36" version="29.3.0">
  <diagram name="Tangled-words" id="f82cf17d8bbfef3b8d1bc3d25e9940d1">
    <mxGraphModel dx="1213" dy="876" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="3200" pageHeight="800" math="0" shadow="0">
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />
        <mxCell id="0c4a-499e" edge="1" parent="1" source="8d67-6c83" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;fillColor=#88B888;strokeColor=#88B888;startArrow=none;startFill=0;endArrow=classic;endFill=1;" target="8342-75e8" value="">
          <mxGeometry relative="1" as="geometry" />
        </mxCell>
        <mxCell id="11bd-50cd" edge="1" parent="1" source="3d24-65d3" st