如何在文本框中允许特定的特殊字符,字母,数字? [英] How to allow particular special characters, letters, numbers in text box?
问题描述
使用正则表达式来避免文本框中的某些特殊字符。
我尝试过:
使用正则表达式,但如何允许特殊的特殊字符,字母,数字?
using regex for avoid some special characters in textbox.
What I have tried:
using regex for this one but how to allow particular special character,letters,numbers?
推荐答案
取决于您现有的正则表达式。
例如:
Depends on your existing Regex.
For example:
^\d+
仅允许数字。
Would allow only numbers.
^[-+]?\d+(\.\d+)?
允许带小数点的数字,以及可选的前导加号或减号。
要允许或禁止特定字符,我们需要知道您要允许的内容 - 但需要获取副本 Expresso [ ^ ] - 它是免费的,它会检查并生成正则表达式。
这将帮助您设计自己的符合您的规范需要。
Would allow numbers with a decimal point, and an optional leading plus or minus.
To allow or disallow specific characters, we'd need to know what you want to permit - but get a copy of Expresso[^] - it's free, and it examines and generates Regular expressions.
It'll help you design your own to fit your specific needs.
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