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). 

Rated 1 out of 5 stars

major bugs ignored, dead project.
https://code.google.com/p/expression-search/issues/detail?id=25&can=1

This review is for a previous version of the add-on (0.8.8).  This user has 2 previous reviews of this add-on.

rkent said he can't co-operate with you, so does me, You should learn how to work with others and respect others work.

For others that not know the background, https://bugzilla.mozilla.org/show_bug.cgi?id=19442

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'?

Excellent! Rated 5 out of 5 stars

This add-on is tremendously helpful! I've been using it for a long time now and still appreciate it day after day. — That said, it's functionality should be matter of course in a good mailer. Many thanks for your work!

This review is for a previous version of the add-on (0.8.6). 

Ctrl + Enter conflicts Rated 4 out of 5 stars

I am using Thunderbird Conversation and Ctrl+Enter conflicts. Is it possible to assign a virtual folder creation to the different key? Other than that, it is great.

This review is for a previous version of the add-on (0.8.6). 

I tried Thunderbird Conversation and seems no conflicts, what conflicts did you see? Besides, Thunderbird Conversation has option page that can assign hot keys.
Thanks.

Works good! Rated 5 out of 5 stars

Thank you for this great addon!

This review is for a previous version of the add-on (0.8.6). 

Must-have addon Rated 5 out of 5 stars

Thanks for this excellent update

This review is for a previous version of the add-on (0.8.5).  This user has a previous review of this add-on.

Great upgrade! Rated 5 out of 5 stars

Thank you for your great upgrade.
Much much better now. It is better as the default thunderbird search. Like also the regex search (never seen it before, maybe it was there before). How do I drag the expression search bar to my own toolbar (I created). I wish also to hide the icons, unread, starred, contact, tags, attachment. Thanks again for your great work!

This review is for a previous version of the add-on (0.8.5).  This user has a previous review of this add-on.

In the addon's settings dialog, you can choose to move the search bar to menu bar or toolbar, but can't move to user defined toolbar.

Also in current design, there's no option to hide the icons, it's moved along with search bar. But you can do it by userChrome.css (https://developer.mozilla.org/en-US/docs/Thunderbird/Thunderbird_Configuration_Files), eg, add the following lines:
#quick-filter-bar-collapsible-buttons {
display: none !important;
}
If you also like to hide the sticky button, use:
#qfb-sticky , #quick-filter-bar-collapsible-buttons {
display: none !important;
}

Perfect! Rated 5 out of 5 stars

Best addition ever. With Expression Search you can drop the buildt-in gloda and quickfilter because this add-on it combines both in one location. Additionally it extends the search features so you'll find exactly what you search.
No idea why this is also called GMailUI but whatever.
For those who also have to work with Outlook and miss the old Lookout Search: this is the similar approach on TB, only better.

This review is for a previous version of the add-on (0.8.4). 

This is awesome! Rated 5 out of 5 stars

This is just awesome! Unless you know what this is you may not appreciate it :) I've few suggestions as I feel this can replace the TB's built in Open Conversation feature (which seems buggy/not satisfying my needs) and by supporting multiple "ExpressionSearch" folders with different key strokes, it can scale to various needs.

I've already modified it to apply text replacement only with SHIFT+Right Click and not with CTRL+Right Click! It has benefits IMO! Also, after CTRL+ENTER, it jumps to ExpressionSearch folder, there has to an easy way to go back to the previous folder. For now I've modified es.js to save the folder location and then use another key stroke to jump there back.

And if search or CTRL+ENTER can open ExpressionSearch folder in the new Tab, it will be just awesome!

I'll reach out to you Wang to get some ideas on how to improve this and see if I can be of any help.

I'm surely going to contribute $$ too!

This add-on must be on the TOP list.

This review is for a previous version of the add-on (0.8.3). 

Thanks. You can send me your modified file or ideas, to opera.wang+es AT gmail.com .

We can also talk through emails.

Powerful Search Tool Rated 5 out of 5 stars

This add-on is simply what it is called to be: a powerful search tool. Very helpful if you easily want to find messages.

This review is for a previous version of the add-on (0.8.3). 

Good Expression Search, but missing GMailUI! Rated 4 out of 5 stars

"Expression Search" works well, but I wish it integrated with Thunderbird Conversations to really emulate GMail.

But what about "GMailUI"? I used to use this extension to switch to GMail's keyboard shortcuts, yet this functionality seems to have been removed since then? Please restore this functionality, I keep inadvertently marking all my messages as junk!

This review is for a previous version of the add-on (0.8.3). 

Compared with original GMailUI 0.6, these features are still missing:

Use 'Y' to archive selected mail to archive folder (use 'a')
Use J/K to move messages up and down, and Ctrl+J to mark a message as junk (conflict with builtin key mapping, use 'f/b' instead)
Key '/' focuses on the quick search bar (use Ctrl+F)

Please try http://kb.mozillazine.org/Keyconfig_extension for change key config.

Sorry for the inconvenience.

it does work in TB7.0 Rated 5 out of 5 stars

I really like this add-on. I use it everyday! Why is it so hard to find, btw, from the main add-on search page?

In reference to the prior review from Massimo advising that "Expression Search" doesn't work with Thunderbird 7.0, it does work. It's a bit confusing because after you upgrade to TB7.0 (at least on my MacBook running 10.7.1), it will complain that "Expression Search / Google Mail UI is incompatible with Thunderbird 7.0" with a little warning triangle. And, indeed, it won't work. But, do not fear. Just uninstall and reinstall Expression Search and it works fine in 7.0.I love the add-on, Wang Opera.

My only enhancement request is that I wish I could do negative combined searches: s:proxy !f:jeff (my example...show me all messages with proxy in the subject line, but not messages from jeff).

This review is for a previous version of the add-on (0.8.3). 

I just change version 0.8.3 to be compatible with TB 7.0 yesterday, that's maybe why it's said incompatible at the first time.

For negative search, please try '-', eg: s:proxy f:-jeff, you can check the help page at Tools->Addons->Expression Search->Options->Help
Next release I'll see if I can made the help page more easy to find.

Problem with TB7 Rated 4 out of 5 stars

Hi,
this version 0.8.3 not function with TB 7.
Help me?

Massimo

This review is for a previous version of the add-on (0.8.3). 

Tested with TB7 and TB8a, both works. When you say 'not function', can you give the details?
Thanks.

Rated 5 out of 5 stars

wonderful add-on, like having cataracts removed - so much easier to find messages!

would love to suggest here it would benefit from one extra search feature, and that's to look within a range based on age eg days:30 / d:30 or even months:3 / m:3 years:2 / y:2

thank you! d

This review is for a previous version of the add-on (0.8.3). 

Try before:2011/03/09 07:12:00 or be:09 Mar 2011 05:00:00 or after:Mar 10, 2011 or af:(2011/03/01 -2011/03/09)
And I may consider your suggestions for future release.
Thanks.

Rated 5 out of 5 stars

I needed to filter my emails by date and this simplet yet powerful addon did it. Indeed, it should be included by default in Thunderbird!

This review is for a previous version of the add-on (0.8.3). 

Rated 5 out of 5 stars

Fast interface. Powerful Expressions. Exzellent Usability. Constant Development. Thank you Wang!

This review is for a previous version of the add-on (0.8.1).