Heavens to Betsy!
Heavens to Murgatroyd!
Well, shit.
ESL websites could be a good resource for compiling these. If there’s a truly comprehensive online source, I’d love to know about it. (Unlike the one I just found that says “The Complete List of English Idioms, Proverbs, & Expressions” and has about 75 of them, haha.)
Here are, supposedly, over 1,500 of them. This is still barely scratching the surface:
https://7esl.com/english-idioms/
Oy vey!
Great Caesar’s ghost!
Sweet fancy Moses!
Jumpin’ Jehosephat!
Holy cats!
Great googly moogly
Shazbot!
Whoa!
Holy fuck!
Are you kidding me?
Great horny-toads!
My perennial favorite:
Gad zooks!
Holy Smokes!
What the actual…?
Egad!
Said by a lady when she realized a vehicle ahead of her was about to be hit by a train:
“Holy mother of moo-moo!”
(From a youtube video; copied often into other videos)
\A(?:[a-z0-9!#$%&'*+/=?^_‘{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_‘{|}~-]+)*
| "(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]
| \\[\x01-\x09\x0b\x0c\x0e-\x7f])*")
@ (?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?
| \[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:
(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]
| \\[\x01-\x09\x0b\x0c\x0e-\x7f])+)
\])\z
Wait, was mmm asking for regular expressions?
Jumping Butterballs!
Blistering barnacles!
Thundering typhoons!