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我有以下文件内容
testing with ---- ---- get footer
我想将它与 ---- ---- 分开。'----'之间可能还有一些其他内容。我正在使用以下内容，但它一直告诉我找不到匹配项。
csplit -f instruction $FILE /^[-]{4}[\s\S]*[-]{4}$/