DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Line Code
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<!DOCTYPE html>
<html>
<style>
@import url(subdir/sheet.css);
</style>
<script>
document.styleSheets[0].cssRules[0].styleSheet
  .insertRule("* { background: url(1x1-green-in-subdir.png) red; }", 0);
</script>