[英]Check if string contains only non-alphanumeric characters
I need to check strings to see if they only contain "Nonalphanumeric characters".我需要检查字符串以查看它们是否仅包含“非字母数字字符”。 basically I can have a string that is ",,.hi" and this would be okay.
基本上我可以有一个字符串“,,.hi”,这样就可以了。 because it contains alphanumeric characters as well as non alphanumeric, but a line that is just "@@#!"
因为它包含字母数字字符以及非字母数字字符,但是一行只是“@@#!” this would be deleted.
这将被删除。 It seems like I would need some type of "Contains" that's not the normal java contains.
似乎我需要某种不是正常 java 包含的“包含”。
Here is what I have tried.这是我尝试过的。
if(line.matches("[^a-zA-Z\\d\\s:]")){
line = line;
} else {
line = line.replace(line, "");
}
If you just want to see if it contains an alphanumeric, then you can find()
it如果你只是想看看它是否包含字母数字,那么你可以
find()
它
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public String clean(String line) {
Pattern p = Pattern.compile("\w");
Matcher m = p.matcher(line);
if (m.find()) {
return line; // found any character or digit, keep the line
}
return ""; // else return nothing
}
Use this regex:使用这个正则表达式:
if(!line.matches("^[a-zA-Z0-9!]*$"))
to check if there is any non-alphanumeric character in your string line
:检查字符串
line
中是否有任何非字母数字字符:
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