java Java从字符串中删除除x以外的非数字字符
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Java remove non numeric characters from string except x
提问by Code Junkie
I'm trying to remove all non numeric characters from string except for x. I'm a little confused.
我正在尝试从字符串中删除除 x 之外的所有非数字字符。我有点困惑。
my current code
我目前的代码
number.replaceAll("[^\d\x]", "")
Thanks in advance.
提前致谢。
回答by Nurlan
回答by stema
Your regex is
你的正则表达式是
number.replaceAll("[^\dxX]+", "");
No need to escape normal characters inside a character class. An improvement is also to have the quantifier +after the character class, that way sequences of those characters are replaced at once and not each char on its own.
无需转义字符类中的普通字符。一个改进也是+在字符类之后使用量词，这样这些字符的序列会被一次替换，而不是每个字符都单独替换。
Read some regex basics on Xisb: What absolutely every Programmer should know about regular expressions
阅读有关Xisb 的一些正则表达式基础知识：绝对每个程序员都应该了解的有关正则表达式的知识
回答by Code Junkie
I figured it out, maybe there's a better way to do it though.
我想通了，也许有更好的方法来做到这一点。
number.replaceAll("[^\d+xX]", "");
回答by Hakan Serce
You should use this:
你应该使用这个：
number.replaceAll("[\D&&[^x]]", "")
