Regular Expressions 101

\ban ASCII word boundary

Negative Lookahead(?!TSPU\b)

TSPUthe literal text TSPU (case sensitive)

\ban ASCII word boundary

Character Class[A-Z]{4,}

{4,}matches at least 4 characters from the set below:

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

Non-Capturing Group(?:(?:\s+\w\.)?\s+\w+)?

?repeats the group contents below at most once:

Non-Capturing Group(?:\s+\w\.)?

?repeats the group contents below at most once:

\s+any whitespace character, repeated at least once

\wany word character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\s+any whitespace character, repeated at least once

\w+any word character, repeated at least once

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

Regular Expression

\b(?!TSPU\b)[A-Z]{4,}(?:(?:\s+\w\.)?\s+\w+)?

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