public static Pattern compilePattern(final String expr) {
        Pattern pattern;
        final int lastChar = expr.length() - 1;
        if (expr.charAt(0) == '/' && expr.charAt(lastChar) == '/') {
            pattern = Pattern.compile(expr.substring(1, lastChar));
        } else {
            pattern = Pattern.compile(Pattern.quote(expr));
        }
        return pattern;
    }
public static Pattern compilePattern ( final String expr ) { Pattern pattern ; final int lastChar = expr . length ( ) - 1 ; if ( expr . charAt ( 0 ) == '/' && expr . charAt ( lastChar ) == '/' ) { pattern = Pattern . compile ( expr . substring ( 1 , lastChar ) ) ; } else { pattern = Pattern . compile ( Pattern . quote ( expr ) ) ; } return pattern ; }
Convert a string to a Pattern object.
<ul>
<li>If the host starts and ends with / then it is compiled as a regular expression</li>
<li>Otherwise the hosts must exactly match</li>
</ul>

@param expr the expression to compile