Implementation code for searching substrings under javascript (script home revised version)_javascript skills

For example, there is such a stringxtxtxt1221, I want to find out the alt values, as well as values ​​in non-labels. In this example, the result is 123xtxtxt3211221yes. Another point is that the original string is uncertain and is input by the user

<title>test</title>
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Original author swust_wu