Can anyone suggest me how to check if a String contains full width characters in Java? Characters having full width are special characters.
Full width characters in String:
ａｂｃ＠ｇｍａｉｌ.ｃｏｍ
Half width characters in String:
解决方案
I’m not sure if you are looking for any or all, so here are functions for both:
public static boolean isAllFullWidth(String str) {
for (char c : str.toCharArray())
if ((c & 0xff00) != 0xff00)
return false;
return true;
}
public static boolean areAnyFullWidth(String str) {
for (char c : str.toCharArray())
if ((c & 0xff00) == 0xff00)
return true;
return false;
}
As for your half width ‘.’ and possible ‘_’. Strip them out first with a replace maybe:
String str=”ａｂｃ＠ｇｍａｉｌ.ｃｏｍ”;
if (isAllFullWidth(str.replaceAll(“[._]”,””)))
//then apart from . and _, they are all full width
Regex
Alternatively if you want to use a regex to test, then this is the actual character range for full width:
[\uFF01-\uFF5E]
So the method then looks like:
public static boolean isAllFullWidth(String str) {
return str.matches(“[\\uff01-\\uff5E]*”);
}
You can add your other characters to it and so not need to strip them:
public static boolean isValidFullWidthEmail(String str) {
return str.matches(“[\\uff01-\\uff5E._]*”);
}
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