Regular Expressions 101

Explanation
Pro

Group 1((([A-Z][a-z]*(\s))([a-z]*(\s))*[a-z]*[.])(\s)*)*

*repeats the group contents below any number of times:

Group 2(([A-Z][a-z]*(\s))([a-z]*(\s))*[a-z]*[.])

Group 3([A-Z][a-z]*(\s))

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group 4(\s)

\sany whitespace character

Group 5([a-z]*(\s))*

*repeats the group contents below any number of times:

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group 6(\s)

\sany whitespace character

Character Class[a-z]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 7(\s)*

*repeats the group contents below any number of times:

\sany whitespace character

Negative Lookahead(?!([A-z0-9]*(\s)))

Group 8([A-z0-9]*(\s))

Character Class[A-z0-9]*

*matches any number of characters from the set below:

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 9(\s)

\sany whitespace character

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26 tokens

((([A-Z][a-z]*(\s))([a-z]*(\s))*[a-z]*[.])(\s)*)*(?!([A-z0-9]*(\s)))

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