Capturing regex groups in VS Code
See here for the original answer.
Use the following in your find and replace tool for the find portion:
<a[^>]*>(.[^<]*)</a>
Then use the capture group for the replace portion:
$1
What this does is looks for <a then any number of characters that are not the closing angle bracket (>). Next it matches all characters up until the next opening angle bracket (<), then looks for the closing </a>. Finally, all the characters in the middle are what is used to replace the matched text, thanks to the capturing group $1.