For a string of letters and numbers
([^>]+)(.*?)
\w to match any single alphanumeric character: 0-9, a-z, A-Z, and _ (underscore)
\s to match any single whitespace character.
\d any single digit
eg.
use some text ([^>]+)(.*?) & something to end string of letters & numbers
<a name="Chapter_LIII" id="Chapter_LIII"></a>
<a([^>]+)(.*?)></a>