Matches/Contains of String class

Comparing the input string using the Matches function and the contains function of the String class.

Matches:

public boolean matches(String regex)

• Tells whether or not this string matches the given regular expression.
• An invocation of this method of the form str.matches(regex) yields exactly the same result as the expression.
• Pattern.matches(regex, str)
• This function allows for comparing strings with a exact match.

Contains:

public boolean contains(CharSequence s)

• Returns true if and only if this string contains the specified sequence of char values.
• This implies that if my charSequence is present at the beginning, middle, or end of the input string (or anywhere within it), it will result in a true value.