VB.Net 验证:检查文本是否仅包含字母 [英] VB.Net Validation: Checking if Text Contains Only Letters

问题描述

需要知道如何验证文本框的文本以确保它只包含没有空格的字母.

Need to know how to validate a Text Box's text to make sure it contains ONLY letters without spaces.

我希望存在某种可以帮助我的函数，例如IsString"之类的.

I was hoping some sort of functions exists which could help me, something like "IsString" or something.

推荐答案

使用 正则表达式

if System.Text.RegularExpressions.Regex.IsMatch(TextBox.Text, "^[A-Za-z]+$")) ...

编辑

^ $ 字符是锚；它们分别表示匹配 start 和 end-of-line，可用于防止子字符串/部分匹配.

The ^ $ character are anchors; they mean match the start and end-of-line respectively and can be used to prevent sub-string/partial matches.

例如正则表达式 X 将匹配 "X" 和 "AAAXAAA" 但 ^X$ 只匹配 "X" 作为它的值可以认为是 "X"

E.g. The regex X would match "X" and "AAAXAAA" but ^X$ only matches "X" as its value can be thought of as "<start of line>X<end of line>"

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