public boolean regionMatches (boolean ignoreCase, int toffset, String other, int ooffset, int len)

Tests if two string regions are equal.

A substring of this String object is compared to a substring of the argument other. The result is true if these substrings represent character sequences that are the same, ignoring case if and only if ignoreCase is true. The substring of this String object to be compared begins at index toffset and has length len. The substring of other to be compared begins at index ooffset and has length len. The result is false if and only if at least one of the following is true:

• toffset is negative.
• ooffset is negative.
• toffset+len is greater than the length of this String object.
• ooffset+len is greater than the length of the other argument.
• ignoreCase is false and there is some nonnegative integer k less than len such that:

   this.charAt(toffset+k) != other.charAt(ooffset+k)
   

• ignoreCase is true and there is some nonnegative integer k less than len such that:

   Character.toLowerCase(this.charAt(toffset+k)) !=
       Character.toLowerCase(other.charAt(ooffset+k))
   

  and:

   Character.toUpperCase(this.charAt(toffset+k)) !=
           Character.toUpperCase(other.charAt(ooffset+k))
   

Parameters:

ignoreCase		if true, ignore case when comparing characters.
toffset		the starting offset of the subregion in this string.
other		the string argument.
ooffset		the starting offset of the subregion in the string argument.
len		the number of characters to compare.

Returns:  true if the specified subregion of this string matches the specified subregion of the string argument; false otherwise. Whether the matching is exact or case insensitive depends on the ignoreCase argument.