This will work only for your case and is not parsing HTML.
DISCLAIMER
First read: https://stackoverflow.com/a/1732454/7939871
This parsing with a
sed
Search-and-replace Regular Expression is a shortcut interpretation.It is in no way for use in any kind of production setup; as it would break on so many valid HTML syntax or layout variations like: namespaces, multi-line, spacing, nesting, use of attributes, entities, CDATA…
sed -E 's#<h1>(.*)</h1>#<h1>\U\1\E</h1>#g' <<<$'<h1>abcd</h1>\n<h2>efgh</h2>'
Basically, it switches-on upper-casing \U
, then prints the captured group 1 \1
, then switches-off upper-casing \E
.
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solved Bash: uppercase text inside html tag with sed