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A set of general entities (amp, lt, gt, apos, quot) is specified for this purpose. Numeric character references may also be used; they are expanded immediately when recognized and must be treated as character data, so the numeric character references " < " and " & " may be used to escape < and & when they occur in character data.] What ...
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& ampersand & < less than sign < > greater than sign > " the double quote sign " Appendix II lists a broad range of characters and symbols, relating their ISO names to the corresponding character codes in common character sets. They allow authors to include accented characters in 7-bit ASCII documents.
With the exception of HTML 2.0's ", &, <, and >, these entities are all new in HTML 4.0 and may not be supported by old browsers. Support in recent browsers is good. Support in recent browsers is good.
Acute: little dash on top, pointing to North-East, Grave: little dash on top, pointing to North-West, Circumflex: like a roof on top of the letter, Umlaut: two dots on top, could also be used as a dieresis, Tilde: wiggle on top, Ring: circle on top, touching the letter. They can appear on capital and lower case versions of A, E, I, O, U, and Y.
Some characters are reserved in XHTML; for example you cannot use the greater than or less than signs or angle brackets within your text beacuse the browser could mistake them for markup. XHTML processors must support the five special characters listed in the table that follows:
str.replaceAll. This is the problem. You are still referencing the original string each time when you should be referencing newStr based on the rest of your code.
So an actual & got an & escape sequence to render an actual & because early parsers couldn't know if the & was the start of an escape sequence or just a literal &. There are many, many more. So when automated escapers and descapers do their thing with inputs and outputs, they sometimes screw up and will escape **&**amp; as **&**amp ...
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