public static boolean isAsciiAlphaLower(char ch) {
        return ch >= 'a' && ch <= 'z';
    }
<p>Checks whether the character is ASCII 7 bit alphabetic lower case.</p>

<pre>
  CharUtils.isAsciiAlphaLower('a')  = true
  CharUtils.isAsciiAlphaLower('A')  = false
  CharUtils.isAsciiAlphaLower('3')  = false
  CharUtils.isAsciiAlphaLower('-')  = false
  CharUtils.isAsciiAlphaLower('\n') = false
  CharUtils.isAsciiAlphaLower('&copy;') = false
</pre>

@param ch  the character to check
@return true if between 97 and 122 inclusive
android/android_framework/base/src/main/java/lang3/CharUtils.java