正则表达式仅限数字，如果用户输入则接受小数。 [英] Regular expression for number only which accept decimal if user inputs it.
问题描述
我想要一个只有数字的正则表达式，没有特殊字符，应该接受带小数点后1位的十进制值
接受值
3
3.2
4
5
不接受价值
abv
''
！
＃
$
％
& *）
（）
4.55
。
123ert.123
ftr456 .34
123tr
3.
< b>我尝试了什么：
i want a Regular expression for Numbers only with no special character that should accept decimal value with 1 decimal place
accepted value
3
3.2
4
5
not accepted value
abv
''
!
#
$
%
& *)
()
4.55
.
123ert.123
ftr456.34
123tr
3.
What I have tried:
i want a Regular expression for Numbers only with no special character that should accept decimal value with 1 decimal place
推荐答案
％
& *）
（）
4.55
。
123ert.123
ftr456 .34
123tr
3.
< b>我尝试了什么：
%
& *)
()
4.55
.
123ert.123
ftr456.34
123tr
3.
What I have tried:
i want a Regular expression for Numbers only with no special character that should accept decimal value with 1 decimal place
谷歌是你的朋友！请使用它 [ ^ ]！有很多例子。看其中几个：
正则表达式 - 精度为2的十进制的简单正则表达式 - 堆栈溢出 [ ^ ]
regex - 十进制数正则表达式，其中十进制数后面的数字是可选的 - Stack Overflow [ ^ ]
c＃ - 十进制数的正则表达式 - Stack Overflow [ ^ ]
Google is your friend! Please, use it[^]! There's tons of examples. See few of them:
regex - Simple regular expression for a decimal with a precision of 2 - Stack Overflow[^]
regex - Decimal number regular expression, where digit after decimal is optional - Stack Overflow[^]
c# - Regular expression for decimal number - Stack Overflow[^]
我想要一个只有数字的正则表达式，没有应该接受带小数点后1位的十进制值的特殊字符
i want a Regular expression for Numbers only with no special character that should accept decimal value with 1 decimal place
这里我们帮助，但这并不意味着我们做你的HomeWork。你做了什么？除了学习RegEx之外还有什么问题？
我们不做你的HomeWork。
HomeWork不会测试你的技能乞求其他人们做你的工作，它会让你思考并帮助你的老师检查你对你所学课程的理解，以及你应用它们时遇到的问题。
你的任何失败都会帮助你的老师发现你的弱点并设定补救措施。
所以，试一试，重读你的课程并开始工作。如果您遇到特定问题，请显示您的代码并解释这个问题，我们可能会提供帮助。
作为程序员，您的工作是创建算法解决特定问题，你不能依赖别人永远为你做，所以有一段时间你必须学会如何。而且越快越好。
当你要求解决方案时，就像试图通过培训其他人来学习开车一样。
创建算法基本上是找到数学并做出必要的调整以适应你的实际问题。
发展的概念就像这个词所暗示的那样：系统地使用科学和满足特定目标或要求的技术知识。 BusinessDictionary.com [ ^ ]
这与有一个不一样快速谷歌并放弃，如果我找不到完全正确的代码。
只是一些有趣的链接，以帮助构建和调试RegEx。
以下是RegEx文档的链接：
perlre - perldoc.perl.org [ ^ ]
这是指向帮助构建RegEx并调试它们的工具：
.NET正则表达式测试程序 - 正则表达式风暴 [ ^ ]
咖啡普通Expressio n工具 [ ^ ]
这个显示RegEx是一个很好的图表，它非常有助于理解RegEx的作用：
Debuggex ：在线视觉正则表达式测试。 JavaScript，Python和PCRE。 [ ^ ]
Here we help, but it doesn't mean we do your HomeWork. What have you done? What the problem other than learning RegEx?
We do not do your HomeWork.
HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them.
Any failure of you will help your teacher spot your weaknesses and set remedial actions.
So, give it a try, reread your lessons and start working. If you are stuck on a specific problem, show your code and explain this exact problem, we might help.
As programmer, your job is to create algorithms that solve specific problems and you can't rely on someone else to eternally do it for you, so there is a time where you will have to learn how to. And the sooner, the better.
When you just ask for the solution, it is like trying to learn to drive a car by having someone else training.
Creating an algorithm is basically finding the maths and make necessary adaptation to fit your actual problem.
The idea of "development" is as the word suggests: "The systematic use of scientific and technical knowledge to meet specific objectives or requirements." BusinessDictionary.com[^]
That's not the same thing as "have a quick google and give up if I can't find exactly the right code".
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.[^]
这篇关于正则表达式仅限数字，如果用户输入则接受小数。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！
