Visual Basic 正则表达式问题 [英] Visual Basic Regular Expression Question

问题描述

我有一个字符串列表.当用户输入字符时，程序会在文本框中显示列表中所有可能的字符串.

I have a list of string. When user inputs chars in, the program would display all possible strings from the list in a textbox.

Dim fruit as new List(Of String) 'contains apple,orange,pear,banana
Dim rx as New Regex(fruit)

例如如果用户输入 a,p,l,e,r ，那么程序将显示苹果和梨.它应该匹配输入了所有字母的任何条目，无论顺序如何，也无论其他字母如何.我应该向 rx 添加什么?如果使用正则表达式无法实现，请指定任何其他方法来执行此操作.

For example If user enters a,p,l,e,r , then the program would display apple and pear. It should match any entry for which all letters have been entered, regardless of order and regardless of additional letters. What should I add to rx? If it's not possible with Regular Expressions, then please specify any other ways to do this.

推荐答案

LINQ Approach:

Dim fruits As New List(Of String) From { "apple", "orange", "pear", "banana" }
Dim input As String = "a,p,l,e,r"
Dim letters As String = input.Replace(",", "")
Dim result = fruits.Where(Function(fruit) Not fruit.Except(letters).Any())

正则表达式方法:

匹配结果的正则表达式模式类似于:

A regex pattern to match the results would resemble something like:

"^[apler]+$"

这可以构建为:

Dim fruits As New List(Of String) From { "apple", "orange", "pear", "banana" }
Dim input As String = "n,a,b,r,o,n,g,e"
Dim letters As String = input.Replace(",", "")
Dim pattern As String = "^[" + letters + "]+$"
Dim query = fruits.Where(Function(fruit) Regex.IsMatch(fruit, pattern))

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