doubi6215 2018-05-27 17:27
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从正则表达式构造字符串

I've trying to find out a way to construct string data from a compiled *regexp.Regexp with given interface{} array. For example:

re := regexp.MustCompile(`(?P<word>\w+)\s*(?P<num>\d+)`)

I want to construct a string from the structure found in re by a string and a int data which may be received as interface{}.

Can't figure out how I can do that in Go. Please help me out.

Thanks in advance.

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  • doujing2497 2018-05-27 17:42
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    While technically not impossible this is a huge amount of work.

    Go regexp package compiles regular expressions into bytecode programs that are then executed to search strings. De-compiling this bytecode back into a regular expression is not impossible but quite difficult and moreover you cannot be sure that the regexp expression you get is the exact same that was used originally... for example

    /(?:a+)+/
    

    and

    /a+/
    

    will be compiled to the same code for matching (expressions are "simplified" before being passed to the code generator).

    Most probably you want to find another solution, like saving the original strings before compiling them into regular expression objects.

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