Grep BRE meta-characters not recognized in Cygin package search

When searching Cygwin packages, latex yields many packages. In the returned information, the word latex occurs as a whole word.

I'm puzzled by why the following expressions do not generate any matches:

<latex>
\<latex\>
\blatex\b

Even if I was mistaken about what constitutes a basic regular expression (BRE), at least one of these should yield the same results as unadorned latex.

What am I missing about BREs and/or the use of them at the Cygwin Package Search site?

Thanks.

Solution

The current problem is between the new WebServer and the search script.
You can bypass with proper escaping using directly the URL.
For what I see only the version \blatex\b works

https://cygwin.com/cgi-bin2/package-grep.cgi?grep=\\blatex\\b&arch=x86_64

 Found 364 matches for \blatex\b

    R-3.6.0-1 - R: R Statistical computing language
    R-3.6.2-1 - R: R Statistical computing language
    R-3.6.3-1 - R: R Statistical computing language
    TeXmacs-1.99.12-1 - TeXmacs: WYSIWYG editor for science and math
    ....