Regular Expressions 101

Explanation
Pro

^start of string

Group 1((?!.*email).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!.*email)

.*any character (except for line terminators), repeated any number of times

emailthe literal text email (case insensitive)

.any character (except for line terminators)

thankthe literal text thank (case insensitive)

Group 2(\-|\_|)

1st Alternative\-

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\_

\_the literal _ (95₁₀ / 137₈ / 5F₁₆)

3rd Alternative — matches an empty string

youthe literal text you (case insensitive)

.*any character (except for line terminators), repeated any number of times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^((?!.*email).)*thank(\-|\_|)you.*

New

http://www.safesteptub.com/thank-you
http://www.safesteptub.com/email/thank-you/

NOTE: 

Newlines are excluded as well.  Please make sure the string you want to test is at the top of the list.