Regular Expressions 101

Pro

Group 1(^\S+\s\S+\s\s|^\S+\s\s)

1st Alternative^\S+\s\S+\s\s

^start of line

\S+any character that is not Unicode whitespace, repeated at least once

\sa Unicode whitespace character

\S+any character that is not Unicode whitespace, repeated at least once

\sa Unicode whitespace character

2nd Alternative^\S+\s\s

^start of line

\S+any character that is not Unicode whitespace, repeated at least once

\sa Unicode whitespace character

Group 2((?![-])|(?![_]))

1st Alternative(?![-])

Negative Lookahead(?![-])

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative(?![_])

Negative Lookahead(?![_])

Character Class[_]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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25 tokens

(^\S+\s\S+\s\s|^\S+\s\s)((?![-])|(?![_]))

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