Java从字符串的开头和结尾删除所有非字母数字字符
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Java remove all non alphanumeric character from beginning and end of string
提问by Mike6679
I know how to replace ALL non alphanumeric chars in a string but how to do it from just beginning and end of the string?
我知道如何替换字符串中的所有非字母数字字符，但是如何从字符串的开头和结尾进行替换？
I need this string:
我需要这个字符串：
"theString,"
“弦”
to be:
成为：
theString
字符串
replace ALL non alphanumeric chars in a string:
替换字符串中的所有非字母数字字符：
s = s.replaceAll("[^a-zA-Z0-9\s]", "");
采纳答案by falsetru
Use ^(matches at the beginning of the string) and $(matches at the end) anchors:
使用^（在字符串开头匹配）和$（在结尾匹配）锚点：
s = s.replaceAll("^[^a-zA-Z0-9\s]+|[^a-zA-Z0-9\s]+$", "");
回答by ranamiteshkumar
This removes all the non-alphanumeric characters
这将删除所有非字母数字字符
s = s.replaceAll("[^a-zA-Z0-9]", "");
回答by Prasad Bhosale
yourString=yourString.replaceAll("^\W+|\W+$","");
回答by Danielson
Use:
用：
s.replaceAll("^[^\p{L}^\p{N}\s%]+|[^\p{L}^\p{N}\s%]+$", "")
Instead of:
代替：
s.replaceAll("^[^a-zA-Z0-9\s]+|[^a-zA-Z0-9\s]+$", "")
Where p{L}is any kind of letter from any language.
And p{N}is any kind of numeric character in any script.
For use in Latin-based scripts, when non-English languages are needed, like Spanish, for instance: éstas, apuntó; will in the latter become; stas and apunt. The former also works on non-Latin based languages.
For all Indo-European Languages, add p{Mn}for Arabic and Hebrew vowels:
p{L}来自任何语言的任何类型的信件在哪里。
并且p{N}是任何脚本中的任何类型的数字字符。
用于基于拉丁语的脚本，当需要非英语语言时，如西班牙语，例如：éstas、apuntó；将在后者成为；stas 和 apunt。前者也适用于非拉丁语系。
对于所有印欧语言，添加p{Mn}阿拉伯语和希伯来语元音：
s.replaceAll("^[^\p{L}^\p{N}^\p{Mn}\s%]+|[^\p{L}^\p{N}^\p{Mn}\s%]+$", "")
For Dravidian languages, the vowels may surround the consonant - as opposed to Semitic languages where they are "within" the character - like ?. For this use p{Me}instead. For all languages use:
对于达罗毗荼语言，元音可能围绕着辅音——而不是闪米特语，它们在字符“内”——如 ?。用于此用途p{Me}。对于所有语言，请使用：
s.replaceAll("^[^\p{L}^\p{N}^\p{M}\s%]+|[^\p{L}^\p{N}^\p{M}\s%]+$", "")
See regex tutorial for a list of Unicode categories
有关Unicode 类别列表，请参阅正则表达式教程
回答by Bunarro
Guava's CharMatcherprovides a concise solution:
Guava 的CharMatcher提供了一个简洁的解决方案：
CharMatcher.javaLetterOrDigit().negate().trimFrom(input);
