用Python中的正则表达式替换变量模式

I am looking for a very particular RegEx (or another solution, close in performance) in Python to substitute patterns, which are in the following examples:

我在Python中寻找一个非常特殊的RegEx(或另一个性能接近的解决方案)来替代模式，如下面的示例所示:

...-1AG.,., should be transformed as ...G.,.,
..,-1A,.,., should be transformed as ..,,.,.,
...-2GTC,., should be transformed as ...C,.,
..,-2GT.,., should be transformed as ..,.,.,
...+3TAGT,, should be transformed as ...T,,
..,+3TAG.,. should be transformed as ..,.,.

Basically:

基本上:

AnySymbol (not only dots and commas), followed by one +/- sign, followed by one letter digit (1..9), followed by several letters, the number of which is dependent on the previous number and finally AnySymbol (not only dots and commas),

任何符号(不只是点和逗号)，后面跟着一个+/-符号，后面跟着一个字母数字(1.. .9)，后面跟着几个字母，这些字母的数量取决于前面的数字，最后是任何符号(不仅仅是点和逗号)，

should be transformed to:

应该转化为:

AnySymbol (not only dots and commas) and AnySymbol (not only dots and commas).

任何符号(不只是点和逗号)和任何符号(不只是点和逗号)。

Obviously the solution: String = re.sub(r'[\-\+]\d\w+', "", String) is not right, if we have case (...-1AG.,., should be transformed as ...G.,.,). So far I am looping over r'[\-\+]1\w', r'[\-\+]2\w\w', r'[\-\+]3\w\w\w' ... r'[\-\+]9\w\w\w\w\w\w\w\w\w', however I am hoping for more elegant solution. Any ideas?

显然，如果我们有case(…- 1ag .)，解决方案是:String = re.sub(r'[\-\+]\d\w+'， ""， String)不正确。，应该转换为…G.，。到目前为止我循环/ r '[\ - \ +]1 \ w ',r '(\)\ +)2 \ w \ w ',r '[\ - \ +]3 \ w \ w \ w”……什么好主意吗?

1 个解决方案

#1

Have a look at this working demo.

看看这个工作演示。

x="""...-1AG.,., should be transformed as ...G.,.,
..,-1A,.,., should be transformed as ..,,.,.,
...-2GTC,., should be transformed as ...C,.,
..,-2GT.,., should be transformed as ..,.,.,
...+3TAGT,, should be transformed as ...T,,
..,+3TAG.,. should be transformed as ..,.,."""

def repl(matchobj):
    return matchobj.group(2)[int(matchobj.group(1)):]

print re.sub(r"[+-](\d+)([a-zA-Z]+)",repl,x)

You can use your own function in re.sub to make customized replacements.

您可以在re.sub中使用自己的函数来定制替换。

#1