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RE 字符 意义与范例
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^word 待搜寻的字符串(word)在行首！
范例：grep -n '^#' regular_express.txt 搜寻行首为 # 开始的那一行！
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word$ 待搜寻的字符串(word)在行尾！
范例：grep -n '!$' regular_express.txt 将行尾为 ! 的那一行打印出来！
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