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Matching a Six-Letter Word Containting "Cat"
\b
(?=
\w
{6}
\b
)
\w
{0,3}
cat
\w
*
Options: case insensitive
Assert position at a word boundary
Assert that the regex below can be matched, starting at this position (positive lookahead)
Match a character that is a "word character" (letters, digits, etc.)
Exactly 6 times
Assert position at a word boundary
Match a character that is a "word character" (letters, digits, etc.)
Between zero and 3 times, as many times as possible, giving back as needed (greedy)
Match the characters "cat" literally
Match a character that is a "word character" (letters, digits, etc.)
Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
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