正则表达式有问题吗? [英] Regular expression problem?

问题描述

我在为打印机对话框编写图案时遇到问题.它必须如下所示:
页数:1-6,9,22-28,31,38

它表示第1至6和9页以及第22至28页以及第31和38页
如何匹配该表达式?
在此先感谢.

I have a problem writing my pattern for printer dialog. It must be like below:
Pages: 1-6,9,22-28,31,38

It means pages 1 to 6 and 9 and pages from 22 to 28 and pages 31 and 38
How can I match this expression?
Thanks in advance.

推荐答案

看看下面的文章.

30分钟正则表达式教程

轻松学习正则表达式(RegEx)

Have a look at below articles.

The 30 Minute Regex Tutorial

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问题要匹配的模式是

1.个别页码，例如9,31
2.页面范围如1-6,22-28
各个页码和页码范围用，以任意顺序分隔.

为此，可以使用以下正则表达式

^\s*((\d+|\d+\s*-\s*\d+)\s*,\s*)*(\d+|\d+\s*-\s*\d+)\s*

As seen from the question the pattern to be matched is

1. Individual page number like 9,31
2. Page range like 1-6,22-28
Individual page numbers and Page range are separated by , in any order.

For this purpose the following regular expression can be used

^\s*((\d+|\d+\s*-\s*\d+)\s*,\s*)*(\d+|\d+\s*-\s*\d+)\s*

表达式^\s*((\d+|\d+\s*-\s*\d+)\s*,\s*)*的第一部分匹配单个页码或页面范围(-包含零个或多个空格)，后跟一个，(包含零个或多个空格)
然后表达式的第二部分确保字符串以单个页码或页范围结束，结尾不带逗号

(\ d + | \ d + \ s *-\ s * \ d +)\ s *

The first part of expression ^\s*((\d+|\d+\s*-\s*\d+)\s*,\s*)* matches either a single page number or a page range (- surrounded by zero or more spaces) followed by a , (surrounded by zero or more spaces)
then the second part of expression ensures that string ends with either single page number or a page range with out a comma at the end

(\d+|\d+\s*-\s*\d+)\s*

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