Edit text should allow text if a. alphabet +number b. alphabet +special charterer c. alphabet only in Android : I am trying to generate a regular expression in Android which can satisfy following conditions:
Edit text can accept:
 
1. Alphabet only
2. Combination of Alphabet  and number
3. Combination of Alphabet  and special character 

Should not accept:
a. Only Number
b. Only Special character 

I tried alot but still, i didn't get any meaningful link. Please try to save my day.