如果有多条，那在第一个正则上也加上g，用于多条匹配：
[code="js"]
var str = "\n2918021984\n 测试呀\n 第街and第号\n"
str.replace(/()(.*?)(<\/Value>)/g, function(value, start, content, end){
return start + content.replace(/<(.*?)>/g, "[$1]") + end;
});

[/code]

[code="js"]
var str = "\n2918021984\n 测试呀\n 第街and第号\n"
str.replace(/()(.*?)(<\/Value>)/, function(value, start, content, end){
return start + content.replace(/<(.*?)>/, "[$1]") + end;
});
[/code]

更正一下，少了个g
[code="js"]
var str = "\n2918021984\n 测试呀\n 第街and第号\n"
str.replace(/()(.*?)(<\/Value>)/, function(value, start, content, end){
return start + content.replace(/<(.*?)>/g, "[$1]") + end;
});
[/code]