Regular Expressions 101

Pro

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

\ba Unicode word boundary

selfthe literal text self (case insensitive)

\ba Unicode word boundary

Non-Capturing Group(?:\s*-\s*employed)?

?repeats the group contents below at most once:

\s*a Unicode whitespace character, repeated any number of times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\s*a Unicode whitespace character, repeated any number of times

employedthe literal text employed (case insensitive)

Negative Lookahead(?!\s+Employed\b)

\s+a Unicode whitespace character, repeated at least once

Employedthe literal text Employed (case insensitive)

\ba Unicode word boundary

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

(?i)\bself\b(?:\s*-\s*employed)?(?!\s+Employed\b)

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