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There is no specific number of regular expression strings in Yara. The number of regular expression strings can vary depending on the specific rules being implemented and the complexity of those rules. One way to determine the number of regular expression strings in a Yara rule set is to review the rules and look for any strings that use regular expressions, indicated by the "/" character at the beginning and end of the string. Additionally, Yara allows for the use of multiple regular expressions within a single string by separating them with the "|" character, so it's important to look for these as well.