鉴于：
This is some text which could have
line breaks and tabs before and after {code}
and I want them {code} to be replaced {code}in pairs{code} without any issues.
我想：
This is some text which could have
line breaks and tabs before and after <code>
and I want them </code> to be replaced <code>in pairs</code> without any issues.
JsFiddle：http: //jsfiddle.net/egrwD/1
简单的工作文本示例：
var sample1 = 'test test test {code}foo bar{code} {code}good to know{code}';
var regEx1 = new RegExp('(\{code\})(.*?)(\{code\})', 'gi');
var r1 = sample1.replace(regEx1, '<code>$2</code>');
给出：
test test test <code>foo bar</code> <code>good to know</code>
非工作样本：
var sample2 = 'test test test {code}\tfoo bar{code} {code}\r\ngood to know{code}';
var regEx2 = new RegExp('(\{code\})(.*?)(\{code\})', 'gi');
var r2 = sample2.replace(regEx2, '<code>$2</code>');
给出：
test test test {code} foo bar{code} {code}
good to know{code}