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#!/usr/bin/perl use strict; use warnings; my $sql="select name,age from user where id=1"; #匹配 print '$sql是一个查询语句!'."\n" if $sql =~ m/^select\s+([\w|,|\*]+)\s+from\s+(\w+)/gi; #不匹配 print '$sql不是xml文本!'."\n" if $sql !~ m/<\s*(\w+)\s*>/gi; #替换 print "替换结果:$sql\n" if $sql =~ s/user/USER/; #转化 print "转化结果:$sql\n" if $sql =~ tr/a-z/A-Z/; #提取 print "表名:$2,查询列:$1\n" if $sql =~ m/^select\s+([\w|,|\*]+)\s+from\s+(\w+)/gi; #拆分 map {print "$_\n"} split(/\s/,$sql);