Android Utililty Methods String to URL Convert

if (TextUtils.isEmpty(_str))
    return "";
String str = _str.trim() + " ";
if (str.matches("^\\w+script:") || str.matches("^file:\\/\\/\\/.+"))
    return "";
Pattern regex = Pattern.compile("(https?://.+?)[\\s'\"<>\\[\\]]");
Matcher matcher = regex.matcher(str);
if (matcher.find()) {
...

if (s == null) {
    return false;
return Pattern.matches(URL_REG_EXPRESSION, s);

if (str == null) {
    return false;
if (str.startsWith("http")) {
    return true;
return false;

if (s == null) {
    return false;
return Pattern.matches(URL_REG_EXPRESSION, s);

return isUrlValid(str, CASE_NON_SENSITIVE);

if (!isNullOrEmpty(input)) {
    String regexExpression = "http://([\\w\\WW-]+\\.)+[\\w\\W-]+(/[\\w\\W- ./?%&=]*)?";
    if (input.matches(regexExpression)) {
        return true;
return false;

if (isEmptyOrNull(url))
    return null;
String domain;
try {
    int pos = url.indexOf("//");
    domain = url.substring(pos + 2);
    int endpos = domain.indexOf("/");
    if (url.indexOf("http") > -1) {
...

Pattern pattern = Pattern
        .compile("(http://|https://){1}[\\w\\.\\-/:]+");
Matcher matcher = pattern.matcher(sb);
StringBuffer buffer = new StringBuffer();
while (matcher.find()) {
    String s = matcher.group(1);
    matcher.appendReplacement(buffer, "<a href=\"" + s + "\">" + s
            + "</a>");
...

if (isEmptyOrNull(imgUrl)) {
    return false;
String regEx = "([^\\s]+(\\.(?i)(jpg|png|gif))$)";
Pattern pattern = Pattern.compile(regEx);
Matcher matcher = pattern.matcher(imgUrl);
return matcher.matches();

try {
    if (!pageUrl.contains("://")) {
        pageUrl = "http://" + pageUrl;
    int end = pageUrl.indexOf("/", pageUrl.indexOf("://") + 4);
    return pageUrl.substring(0, end);
} catch (Exception e) {
return null;