Replace using regex?
I have an unusual Find/replace question. I know Sigil uses PCRE in its Find/Replace. My question is: Can the replacement text use any regex besides \1 grouping? Specifically I would like to find and uppercase some text between a <span></span>. I can find the text but can I uppercase it within the replace operation within Sigil? Or using regular expressions at all? Is that a thing?
TIA
--MH
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