Perl: August 2007 Archives
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.
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October 2008
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