Normal
======

Level        |Score| Regex                                              | Credit
------------ |:---:| -------------------------------------------------- | ------
Warmup       | 207 | `foo`                                              | 
Anchors      | 208 | `k$`                                               |
Ranges       | 202 | `^[a-f]*$`                                         |
Backrefs     | 201 | `(...).*\1`                                        | gorhill (HN)
Abba         | 195 | <code>^(?!.*(.)\1)&#124;ef</code>                  | BeniaminK (GH)
A man, a plan| 177 | `^(.)[^p].*\1$`                                    | hyp0 (HN)
Prime        | 286 | `^(?!(..+)\1+$)`                                   | josephlord (HN)
Four         | 199 | `(.)(.\1){3}`                                      | chrismorgan (HN) / MereInterest (HN)
Order        | 199 | `^.{5}[^e]?$`                                      | ekke (HN)
Triples      | 596 | <code>00($&#124;3&#124;6&#124;9&#124;12&#124;15)&#124;4.2&#124;.1.+4&#124;55&#124;.17</code>| alexandrosm (GH)
Glob         | 397 | <code>ai&#124;c$&#124;^p&#124;[bcnrw][bnopr]</code>| nwellnhof (HN)
Balance      | 452 | <code>^$&#124;.{37}&#124;^<(.(?!><&#42;.>$).)&#42;>$</code>| Davidebyzero (GH)
Powers       | 93  | `^(?!(.(..)+)\1*$)`                                | plby (GH)
Long count   | 256 | `((.+)0\2+1){8}`                                   | Davidebyzero (GH)
Alphabetical | 317 | <code>.r.{32}r&#124;a.{10}te&#124;n.n..</code>     | alexandrosm (GH)
Powers 2     | 88  | <code>^(?!((xxx)+x&#124;xx&#124;)\1*$)</code>      | muxrwc (GH)

Hard Mode
=========

Level        |Score| Regex                                              | Credit
------------ |:---:| -------------------------------------------------- | ------
Warmup       | 207 | `foo`                                              | 
Anchors      | 206 | `ick$`                                             | Davidebyzero (GH)
Ranges       | 202 | `^[a-f]*$`                                         |
Backrefs     | 201 | `(...).*\1`                                        | gorhill (HN)
Abba         | 193 | `^(?!.*(.)(.)\2\1)`                                | chingjun (HN) / josephlord (HN)
A man, a plan| 150 | `^(.?)(.?)(.?)(.?)(.?)(.?).?\6\5\4\3\2\1$`         | jonathanmorley (GH)
Prime        | 284 | `^(?!(xx+)\1+$)xx`                                 | Davidebyzero (GH)
Four         | 199 | `(.)(.\1){3}`                                      | chrismorgan (HN) / MereInterest (HN)
Order        | 156 | `^a*b*c*d*e*f*g*h*i*j*k*l*m*n*o*p*q*r*s*t*u*v*w*x*y*z*$`| Davidebyzero (GH)
Triples      | 524 | <code>(?=((.&#42;?[147]){3})&#42;((.&#42;?[147]&#124;){2}))(?=((.&#42;?[258]){3})&#42;((.&#42;?[258]&#124;){2}))^.*$(\3\7&#124;(?!\3&#124;\7)\4\8&#124;(?!\4&#124;\8))</code> | teukon (GH)
Glob         | 297 | <code>ai&#124;c$&#124;^p&#124;[bcnrw][bnopr]</code>| nwellnhof (HN)
Balance      | 443 | `^(<(<(<(<(<(<(<>)*>)*>)*>)*>)*>)*>)*$`            | gkucmierz (GH)
Powers       | 93  | `^(?!(.(..)+)\1*$)`                                | plby (GH)
Long count   | 235 | `^((?=(\S*)0).{4} (?=\2[1])){15}\2.$`              | teukon (GH)
Alphabetical | 282 | <code>^(?!.&#42;\b(.&#42;)(e&#124;(n&#124;r&#124;(s&#124;t))).* \1(a&#124;(?!\3)[en]&#124;(?!\4)[rs]))</code>| teukon (GH)
Powers 2     | -12 | <code>^(?!((xxx)+x&#124;xx&#124;)\1*$)</code>      | muxrwc (GH)