s/\$NICK(?<!\\\$NICK)/$nick/g; 将文本中$NICK替换为变量$nick, 当且仅当$前不是\. "hello, $NICK"可以被替换, 而"using \$NICK" 在中的$NICK则不会被替换掉.
用正则表达式Look-Ahead做带逃逸的变量替换
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s/(?
这样可以少打几个字呵呵
晕,被过滤掉了,再试试:
s/(?<!\\)\$NICK/lc/e;
汗,过滤了小于符号,只好写<了呵呵