JavaScript Regex: Replace |b| with <b>

return phoneStr.replace(/[a-zA-Z]/g, function(m) {
    var ix= m[0].toLowerCase().charCodeAt(0)-0x61; // ASCII 'a'
    return '22233344455566677778889999'.charAt(ix);
});

StringBuffer b= new StringBuffer();
Matcher m= Pattern.compile("[A-Za-z]").matcher(phoneStr);
while (m.find()) {
    int ix= (int) (m.group(0).toLowerCase().charAt(0)-'a');
    m.appendReplacement(b, "22233344455566677778889999".substring(ix, ix+1));
}
m.appendTail(b);
return b.toString();

char[] c= phoneStr.toLowerCase().toCharArray();
for (int i= 0; i<c.length; i++)
    if (c[i]>='a' && c[i]<='z')
        c[i]= "22233344455566677778889999".charAt((int) (c[i]-'a'));
return new String(c);

// Original string
var o = "MySql is a DBMS, whereas javascript is a client side scripting language";

//Patterns
var patterns = {
    "javascript": "http://js.com/",
    "mysql": "http://www.mysql.com/"
};

//Constructing regex
RegExp.escape= function(s) {
    return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')
};
var keys = [];
for (i in patterns) {
    if (patterns.hasOwnProperty(i)) {
        keys.push(RegExp.escape(i));
    }
}
var pattern = new RegExp("\\b(" + keys.join("|") + ")\\b", "gi");

//Replace
var n = o.replace(pattern, function(m, g1) {
    return "<a href='" + patterns[g1.toLowerCase()] + "'>" + g1 + "< /a>";
});
console.log(n);

// Original string
var o = '<p>Test 1 (JavaScript - <strong>1st keyword instance to be replaced</strong>): <br><a href="http://js1.net">Link to JavaScript site (existing URL)</a> is a scripting language commonly implemented as part of a web browser in order to create enhanced user interfaces and dynamic websites. JavaScript is very flexible.</p><p>more text here... and another mention of JavaScript. also javascript and JAVAScrIPT <br><br></p><p>Test 2 (MySQL - <strong>1st keyword instance to be replaced</strong>): <br><a href="http://www.mysql.com">MySQL</a>  (existing URL) is the most popular open-source database system.</p> <p><a href="http://www.themysqllink.com">link to a MySQL site</a> (existing URL).</p><p> More stuff about Mysql, also mysql and mySQL</p>';

//Patterns
var patterns = {
    "javascript": "http://js.com/",
    "mysql": "http://www.mysql.com/",
    "mention": "http://www.x.com/"
};

//Number of replacements
var num = 1;

//Constructing regex
RegExp.escape = function(s) {
    return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
};
var keys = [];
for (key in patterns) {
    if (patterns.hasOwnProperty(key)) {
        keys.push(RegExp.escape(key));
    }
}
var regexen = [];
for (var i = 0; i < keys.length; i++) {
    regexen[i] = new RegExp("\\b(" + keys[i] + ")\\b(?![^<]*?<\/a>)", "i");
}

//Replace
for (var i = 0; i < regexen.length; i++) {
    var count = 0;
    var pattern = regexen[i];
    while (count < num) {
        o = o.replace(pattern, function(m, g1) {
            return "<a href='" + patterns[g1.toLowerCase()] + "'>" + g1 + "</a>";
        });
        count++;
    }
}
document.write(o);

    String passedInToken = "this is the token";
    String srcPath = "/pathabc";
    StringBuffer sb = new StringBuffer();
    String srcPatternString = "(src=\".*?\")";
    Pattern srcPattern = Pattern.compile(srcPatternString);

    String patternString = "(?:<img\\s)([^<]*)(?:token=\""+passedInToken+"\"\\s*)([^>]*)>";
    Pattern pattern = Pattern.compile(patternString);
    Matcher matcher = pattern.matcher(htmlStr);

     while(matcher.find()) {

        String srcPart = matcher.group(1) + " " + matcher.group(2);

        StringBuffer srcSb = new StringBuffer();
        Matcher strMatcher = srcPattern.matcher(srcPart);
        while (strMatcher.find()) {
                strMatcher.appendReplacement(srcSb, strMatcher.group(1)+ srcPath);
        }
        strMatcher.appendTail(srcSb);
                String srcStr = "<img \"" + srcSb.toString() + ">";
        matcher.appendReplacement(sb, srcStr);
    }
    matcher.appendTail(sb);
    String newHtmlStr = sb.toString();

/pattern/flags

var foo = li.replace(/[\s'()]+/g, "");

var result = "/wiki/home/de/wikihome.md".replace(/(\/wiki\/home)\/..\/(.*\.md)/, "$1/en/$2");
document.body.innerHTML = result;