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            String str = "abc";
Pattern pattern = Pattern.compile("[a-z]");
Matcher matcher = pattern.matcher(str);
if (matcher.matches()) {
           

}


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          a
          b
          c
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---

Pattern pattern = Pattern.compile("[a-z]*");

---

String str = "abc";
Pattern pattern = Pattern.compile("[a-z]?");
Matcher matcher = pattern.matcher(str);
while(matcher.matches()) {
         

}

---

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---

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---

Java code:
public static void main(String[] args) {
String str = "abc";
Pattern pattern = Pattern.compile("[a-z]",Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
System.out.println(matcher.group());
}

}

http://deerchao.net/tutorials/regex/regex.htm