拆分表达式，但离开分离

问题描述：

name=="sometext" 
value!=4

我想这样的表达式与字符串分隔符，如“==”和分裂，并保持这些分隔，因此结果将是：

name=="sometext" -> [name] [==] ["sometext"] 
value!=4   -> [value] [!=] [4]

怎么可以用Boost或其他库？

的解释是表达已经是一个字符串，或者是他们喜欢的代码？为什么，你为什么要分裂他们呢？ – Xeo

这是一个不同的问题，但答案是相同的你的情况：http://stackoverflow.com/questions/5768948/extract-variables-from-string-math-expression/5769005#5769005 – atoMerz

@Xeo：他们是字符串，而不是代码。 – scdmb

答

有了提升，我会用这个简单的正则表达式：

(.*?)(==|!=)(.*)

编辑：提供的表达是一个字符串。

编辑2：正则表达式

// (.*?)(==|!=)(.*) 
// 
// Match the regular expression below and capture its match into backreference number 1 «(.*?)» 
// Match any single character that is not a line break character «.*?» 
//  Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» 
// Match the regular expression below and capture its match into backreference number 2 «(==|!=)» 
// Match either the regular expression below (attempting the next alternative only if this one fails) «==» 
//  Match the characters “==” literally «==» 
// Or match regular expression number 2 below (the entire group fails if this one fails to match) «!=» 
//  Match the characters “!=” literally «!=» 
// Match the regular expression below and capture its match into backreference number 3 «(.*)» 
// Match any single character that is not a line break character «.*» 
//  Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»

拆分表达式，但离开分离

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