正则表达式，用于匹配各种类型的编号列表 [英] Regular expression for matching a variety of types of numbered lists

问题描述

我想创建一个(PCRE)正则表达式以匹配所有常用的编号列表，并且我想分享自己的想法并收集输入信息的方式.

I'd like to create a (PCRE) regular expression to match all commonly used numbered lists, and I'd like to share my thoughts and gather input on way to do this.

我已将列表"定义为英国盎格鲁-撒克逊规范化规范集，即

I've defined 'lists' as the set of canonical Anglo-Saxon conventions, i.e.

1 2 3
1. 2. 3.
1) 2) 3)
(1) (2) (3)
1.1 1.2 1.2.1
1.1. 1.2. 1.3.
1.1) 1.2) 1.3)
(1.1) (1.2) (1.3)

字母

a b c
a. b. c.
a) b) c)
(a) (b) (c) 
A B C
A. B. C. 
A) B) C)
(A) (B) (C)

罗马数字

i ii iii
i. ii. iii.
i) ii) iii)
(i) (ii) (iii)
I II III
i. ii. iii.
i) ii) iii)
(i) (ii) (iii)

我想知道列表的强度，是否应该有其他编号约定，以及是否应删除其中的任何编号.

I'd like to know how strong a set of list this is, and if there are other numbering conventions that should be in there, and if any of these ought to be removed.

这是我为解决此问题而创建的正则表达式(在 Python 中):

Here's a regular expression I've created to solve this problem (in Python):

numex = r'(?:\d{1,3}'\   # 1, 2, 3
    '(?:\.\d{1,3}){0,4}'\ # 1.1, 1.1.1.1
    '|[A-Z]{1,2}'\        # A. B. C.
    '|[ivxcl]{1,6}'       # i, iii, ...

rex = re.compile(r'(\(?%s\)|%s\.?)' % numex, re.I) # re.U?

rex.match("123. Some paragraph")    

我想知道此正则表达式是否足以解决此问题，以及是否还有其他替代方法(正则表达式或其他方法).

I'd like to know how adequate this regex is for this problem, and if there are other alternative (regex or otherwise) solutions.

顺便说一句，对于我的特定用例，我预计列表编号不会超过25-50.

Incidentally, for my particular use-case, I wouldn't expect list numbers of more than 25-50.

感谢您阅读.

布莱恩

推荐答案

以下是Wikified解决方案:

 numex = r"""^(?:
      \d{1,3}                 # 1, 2, 3
          (?:\.\d{1,3}){0,4}  # 1.1, 1.1.1.1
    | [B-H] | [J-Z]         # A, B - Z caps at 26.
    | [AI](?!\s)            # Note: "A" and "I" can properly start non-lists
    | [a-z]                 # a - z
    | [ivxcl]{1,6}          # Roman ii, etc
    | [IVXCL]{1,6}          # Roman IV, etc.
    )
    """

 rex = re.compile(r'^\s*(\(?%s\)|%s\.?)\s+(.*)'
   % (numex, numex), re.X)

最欢迎添加，更改和建议.

Additions, changes and suggestions most welcome.

这篇关于正则表达式，用于匹配各种类型的编号列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！