regex.alf.nu

regex.alf.nu_solution.md

Solutions for regex.alf.nu (easy mode)

1. Warmup (207)

    foo
   

2. Anchors (208)

    k$
   

3. Ranges (202)

    ^[a-f]*$
   

4. Backrefs (201)

    (...).*\1
   

5. Abba (165)

    ^(a[cem]|bar|ca|di|ef|go|[fnvpr]|su|tr?a|unv)
   

6. A man, a plan (177)

    ^(.)[^p].*\1$
   

7. Prime (282)

    ^(?!((xx+)\2+|x)$)
   

8. Four (199)

    (.)(.\1){3}
   

9. Order (191)

    ^[a-m][c-o].*[^ed]$
   

10. Triples (587)

    90.5|24|5[45]|191|9.7|177|00($|[369]|1[25])
    

11. Glob (386)

    rr|^(p|do|[bclmwr][^ab]|\*[ifptv])
    

12. Balance (446)

    ^(<(<(<(<(<(<.*>)*>)*>)*>)*>)*>)*$
    

13. Powers (93)

    ^(?!(x(xx)+)\1*$)
    

14. Long count (219)

    ^0+ 0+1 .*0011 0100 0101 0110 01+ 10+ 1001 1010 101
    

15. Alphabetical (289)

    e a?e|rt r|nt st|et te|st s|s ren|ee ta|a sea|r tea
    

16. Powers 2 (88)

    ^(?!(x(xxx)+|xx|)\1*$)
    

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Score 3940