I need the regex expression which would accept only alphanumeric data.
Say for eg: ABC12DG - should allow this
if input data is 123000 - should not allow as it is only numeric.
I have tried this
say a is a string which contains the input data
then a.matches("^[a-zA-Z0-9]+$") this allows both the first and second input as above
I only want it to allow the alphanumeric input , not just numeric or alphabets How to do that
Use negative lookahead or alternation operator.
a.matches("^(?![A-Za-z]+$)(?!\\d+$)[a-zA-Z0-9]+$");
(?![A-Za-z]+$) asserts that the match won't contain only alphabets.(?!\\d+$) asserts that the match won't contain only digits.[a-zA-Z0-9]+ Matches one or more alphanumeric characters.or
a.matches("^[a-zA-Z0-9]*(?:[a-zA-Z]\\d|\\d[a-zA-Z])[a-zA-Z0-9]*$");
You can try this Regex for your text:
String reg = "\\p{Alpha}+\\d+";
String str1 = "It &* is %$ now OK 2015";
String str2 = "ItisnowOK2015";
String str3 = "888";
String str4 = "aaa";
System.out.println("str1 = "+str1.matches(reg));
System.out.println("str2 = "+str2.matches(reg));
System.out.println("str3 = "+str3.matches(reg));
System.out.println("str4 = "+str4.matches(reg));
And is the result:
str1 = false
str2 = true
str3 = false
str4 = false
aaa and 888 . But this is not op expects..