Challenges

68 challenges across eight tiers. Tier 8 is a warm-up; tier 1 will take an evening. Nothing is locked — play them in any order.

Mode

Tag

Tier 4 · Enchanter13 points each

FEN Shapepar 51
Validate the short two-field FEN: eight ranks separated by slashes, then a space and the active colour.
match

Tier 5 · Conjurer8 points each

Commented Outpar 6
From a config file, extract every whole line that is commented out — every line beginning with a #. Inline comments on the end of a real setting do not count.
extract
Digits And Nothing Elsepar 5
Match strings made up entirely of digits, with at least one digit.
match
Starts With HTTPpar 5
Match strings that begin with "http".
match
The Word Catpar 8
Extract "cat" only where it stands as a whole word.
extract
Trailing Whitespacepar 3
Match strings that end with whitespace — the ones your linter shouts about.
match

Tier 7 · Apprentice3 points each

Just The Extensionpar 8
Capture the file extension of a filename: report.q3.pdf gives pdf, not q3.pdf.
capture

All challenges — RegexWars