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How can I set up message rules that are not case sensitive

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I have rules to move certain email addresses to a Deleted folder. However, one email has identified that the rule is case sensitive. The various senders are using emails that were somehow obtained from certain companies and I know who they are, including The Times. One of the senders has changed one character from lower case to upper case and the rule doesn't work. For now I've added the variation to the rule but it's a massive task to do this for all possible combinations for each of the offending email addresses. So can I make the rule case insensitive?

I have rules to move certain email addresses to a Deleted folder. However, one email has identified that the rule is case sensitive. The various senders are using emails that were somehow obtained from certain companies and I know who they are, including The Times. One of the senders has changed one character from lower case to upper case and the rule doesn't work. For now I've added the variation to the rule but it's a massive task to do this for all possible combinations for each of the offending email addresses. So can I make the rule case insensitive?

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I'm surprised to hear that filters appear to be case sensitive. I have always entered filter patterns in lower case and in my experience they match upper case variants too.

However, one solution is to install FiltaQuilla and learn about regular expressions ("regexes"). This provides a switch which tells it to ignore case. e.g.

/the times/i

would match "the times" with any mix of upper and lower case letters. (The /i is a switch to ignore case.) FiltaQuilla offers regexes only in the subject and address boxes; another add-on, Expression Search / Googlemail UI adds regexes for body text too.