Regular Expressions 101

\ba Unicode word boundary

Group pat(?<pat>[whlb])

Character Class[whlb]

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive)

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Non-Capturing Group(?:\s*x\s*(?<pat>[whlb]))+

+repeats the group contents below at least once:

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

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

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

Group pat(?<pat>[whlb])

Character Class[whlb]

wthe literal w (119₁₀ / 167₈ / 77₁₆) (case sensitive)

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

\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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Search reference

Regular Expression

\b(?<pat>[whlb])(?:\s*x\s*(?<pat>[whlb]))+\b

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