应该接受字母和regex_only一个空格但不能在开头和结尾;没有数字和特殊字符允许 [英] Should accept alphabets and with regex_only one space but not in begin and end; no number and special chars allowed

问题描述

嗨朋友们，



请您为下面提供常规快递。



应该接受字母和只有一个空格但不在开头和结尾;没有数字和特殊字符





以下内容应该通过：

A

AB

Hello There



以下内容应该失败：



A

A

A

测试



我的尝试：

Hi Friends,

Please will you provide regular express for the below.

should accept alphabets and with only one space but not in begin and end; no number and special chars allowed


The following should pass:
"A"
"A B"
"Hello There"

The following should fail:

" A"
"A "
" A "
" test"

What I have tried:

"^([a-zA-Z]+\S{0,1})*[a-zA-Z]+$"

推荐答案

引用：

^（[a-zA-Z] + \ S {0,1}）* [a-zA-Z] +

^([a-zA-Z]+\S{0,1})*[a-zA-Z]+

据我所见，您的RegEx是正确的你需要提供更多关于它如何失败的信息。



只是一些有趣的链接来帮助建立和调试RegEx。

这里是RegEx文档的链接：

perlre - perldoc.perl.org [ ^ ]

以下是帮助构建RegEx并调试它们的工具的链接：

.NET Regex Tester - Regex Storm [ ^ ]

Expresso正则表达式工具 [< a href =http://www.ultrapico.com/expresso.htmtarget =_ blanktitle =New Window> ^ ]

这个显示RegEx作为一个很好的图表，它非常有助于理解RegEx的作用：

Debuggex：在线可视正则表达式测试器。 JavaScript，Python和PCRE。 [ ^ ]

As far as I can see, your RegEx is correct. You need to provide more informaions on how it fail.

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

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