通过SAS中的正则表达式在字符串内进行多次搜索和替换 [英] Multiple search and replace within a string through regular expression in SAS

问题描述

我有以下宏变量:

%let text = abc\pqr{work};

我需要将 \ 替换为 \\，将 { 替换为 \{ 和 } 与 \} 正则表达式.

I need to replace \ with \\, { with \{ and } with \} by regular expression.

我试过的代码出错了.

%let text = abc\pqr{work};
data _null_;
   var=prxchange('s/\\/\\\\/|s/\{/ \\\{/|s/\}/ \\\}/',-1,"&text");
   put var;
run;

另外，如果文本是BOLD\ITALIC\ITALICBOLD\BOLDITALIC\B\I\IB\BI"，我需要将其转换为\b\i\ib\bi\b\i\ib"\bi".

Also, if the text is "BOLD\ITALIC\ITALICBOLD\BOLDITALIC\B\I\IB\BI", I need to convert it to "\b\i\ib\bi\b\i\ib\bi".

推荐答案

对于您的第一个问题，您应该将每个模式分离到单独的 PRXCHANGE 中.我认为 PRXCHANGE 中不允许 OR 操作数.如果运行此代码，它将为您工作:

For your first problem, you should be separating each pattern into a separate PRXCHANGE. I don't think PRXCHANGE allows OR operand in it. If run this code, it will work for you:

%let text = abc\pqr{work};
data _null_;
   var=prxchange("s/\\/\\\\/",-1,"&text");
   var=prxchange("s/\{/\\\{/",-1,var);
   var=prxchange("s/\}/\\\}/",-1,var);
   put var;
run;

同样的原则适用于您的第二个查询:

The same principle applies to your second query:

%let text = BOLD\ITALIC\ITALICBOLD\BOLDITALIC\B\I\IB\BI;
data _null_;
   var=prxchange("s/BOLD/b/",-1,"&text");
   var=prxchange("s/ITALIC/i/",-1,var);
   var=lowcase(var);
   put var;
run;

请注意，瓦西里

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