Great extension, works very well Rated 5 out of 5 stars

As others have stated, this extension should be an integral part of Thunderbird. In my case, the Thunderbird built-in searches were slow and less than successful, and lacked the capability of more complicated searches.

I have been using it for a number of months and have not run into any issues.

For those people who indicated that "it doesn't work" or something similar, remember to toggle on View->Toolbars->Quick Filter Bar, otherwise you will not see the correct filter field in which to enter Expression Search (ES) functions and parameters.

Also, for those people who decry the lack of a global search or ability to search subfolders, all you need to do is create a Saved Search folder and run ES on that folder. You can modify the folder on-the-fly by right-clicking it and choosing "Properties."

Works great, with one small flaw Rated 4 out of 5 stars

I don't understand why so many people prefer web mail interfaces these days. I feel that a local client like Thunderbird is far more comfortable and flexible to handle, with one exception: The search function in GMail is more convenient to use than the one in Thunderbird. Expression Search / GMailUI brings the same functionality to Thunderbird. For me it works just fine, I couldn't observe any of the bugs that same others have reported in their reviews. However, I did observe one other bug: With this extension installed, the menu bar no longer works. It's still there, but no longer clickable. As all menu bar options are also available from the "hamburger" menu, this is not a disaster. It's still an acceptable trade-off for the added value provided by this extension.

worked well for a couple of days... then stopped Rated 2 out of 5 stars

This add-on worked well for a couple of days. Then it stopped working. It has added a second search box which does nothing at all (this is present regardless of the setting of "Hide Normal Filter"). I've tried removing it and reinstalling it, that doesn't fix it. Thunderbird 52.2.1 on MacOS Sierra 10.12.6.

This review is for a previous version of the add-on (1.1). 

Fixed in 1.2 and waiting for review.

Suggestion Rated 3 out of 5 stars

Would be perfect if it could detect all accounts & filter (delete from server) emails where "my email address (es) isn't on the "To" field.

This review is for a previous version of the add-on (1.0).  This user has a previous review of this add-on.

A must-have! Rated 5 out of 5 stars

works great and is definitely adding to help finding quickly what you look for in the jungle of emails one receives daily! Thanks to the developer!

This review is for a previous version of the add-on (1.0). 

Perfect Rated 5 out of 5 stars

The stock search is a**, this is just how it should be.

This review is for a previous version of the add-on (1.0). 

works very well! Rated 5 out of 5 stars

fromre:(foo|bar)

This review is for a previous version of the add-on (1.0). 

why is this even an add-on? Rated 5 out of 5 stars

this is what always bugged me about thunderbird. the kind of random uncontrollable search engine. this helps tremendously. should be just a build-in feature.

This review is for a previous version of the add-on (1.0). 

Doesn't work Rated 1 out of 5 stars

It fails to do the most basic thing stated on the available document.

This review is for a previous version of the add-on (1.0). 

Must-Have Rated 5 out of 5 stars

This is so obviously needed that I think it should be integrated inside Thunderbird.

This review is for a previous version of the add-on (1.0). 

Great! This was the missing point... Rated 5 out of 5 stars

So great, I'm now able to search even in very old mails. I love it!

This review is for a previous version of the add-on (1.0). 

My main Thunderbird AddOn Rated 5 out of 5 stars

Expression search is so useful to find certain e-mails in a huge haystack. Thanks a lot for maintaining this great AddOn.

This review is for a previous version of the add-on (1.0).  This user has a previous review of this add-on.

TB45 : Working Rated 5 out of 5 stars

There was no way to update to the newer gmailui-1.0-tb.xpi with the AddOn Updater (always gave a download-error) !
The good news is : after downloading the gmailui-1.0-tb.xpi manually / locally and installing (actually updating) from the saved file, it works in TB45

This review is for a previous version of the add-on (0.9.1-let-fixed). 

Great, but no global search Rated 4 out of 5 stars

Its a great tool, the only thing I find sad is that global search over all folders or Sub folders ins not possible.
I understand that there might be a reason for this behavour.
As a workaround I want to ask the developer to consider this feature:
* Add a setting 'remember search term' on/off
* When on, don't clear the search term field when the users cycles through the folders

Is this possible? Any other ideas for workarounds?
Thanks & Regards

This review is for a previous version of the add-on (0.9.1-let-fixed). 

Makes it possible to search all the ways I can dream of Rated 5 out of 5 stars

Superb time saver! This extension makes me not miss GMail anymore. And the help tooltip is actually really helpful.

This review is for a previous version of the add-on (0.9.1-let-fixed). 

Great improvement over default behavior + excellent developer support Rated 5 out of 5 stars

Once you install this extension, you realize how much you missed it before. All the times you half-consciously thought "if only I could use multiple criteria or a regular expression here, I'd find that mail immediately"...

It is a pity that a Global search reverts to the 'old' way of searching, without regex and with very simple boolean logic. But you can't have everything.

EDIT - the developer fixed the issue mentioned below within a few days after I reported it. Well done, excellent support!
[There is one little glitch: if you put the Expression Search widget in the ToolBar, it is impossible to hide the Quick Filter Bar. Thunderbird simply doesn't allow it (in the menu: View... Toolbars... Quick Filter Bar). The empty bar keeps taking up space above the list of mails. (TB 31.5.0 on OS X 10.10.2)]

This review is for a previous version of the add-on (0.8.8). 

Please report this issue @ https://github.com/wangvisual/expression-search/issues with a screen-shot for the 'empty bar'.

I can't reproduce, yes the menu in TB won't work but I don't have the 'empty bar'.

Saves a lot of time Rated 5 out of 5 stars

I've used it for years, and it never failed.

This review is for a previous version of the add-on (0.8.8).  This user has a previous review of this add-on.

Very convenient for search, and also for saving vertical space Rated 5 out of 5 stars

Most useful add-on. And not only for the very convenient search operators it provides, but also because it can be placed in the menu bar and it allows one to hide TB normal filter, thus saving a great amount of precious vertical space.

I'd have one request: whether the appearance of the quick-filter buttons could be optional, so that people, like I, who don't use them could save some horizontal space in the menu bar.

Thank you for this awesome addon!

This review is for a previous version of the add-on (0.8.8). 

Please try 0.9beta @ https://github.com/wangvisual/expression-search/blob/master/beta/gmailui-0.9-tb.xpi

Very helpful Rated 5 out of 5 stars

It's easier now to make the transition from Emacs/Notmuch to Thunderbird

This review is for a previous version of the add-on (0.8.8). 

Excellent add-on, just one question Rated 5 out of 5 stars

This is an excellent add-on that makes my life a lot easier when searching through messages. I have run in one funny where body:test would return no results but bodyre:test will. Could someone throw some light in why this might be the case?

This review is for a previous version of the add-on (0.8.8). 

For version 0.8.8, the addon will try both text/html and plain text match against pattern for bodyre, but for searching in body, it's built-in of TB, I think it's only match plain text part.

So the real question is which one of your test is correct, did the mail message contain 'test'?