Regular Expressions 101

\ba Unicode word boundary

Non-Capturing Group(?:SO|OS|O[HS]|[SO])

1st AlternativeSO

SOthe literal text SO (case sensitive)

2nd AlternativeOS

OSthe literal text OS (case sensitive)

3rd AlternativeO[HS]

Othe literal O (79₁₀ / 117₈ / 4F₁₆) (case sensitive)

Character Class[HS]

Hthe literal H (72₁₀ / 110₈ / 48₁₆) (case sensitive)

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

4th Alternative[SO]

Character Class[SO]

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

Othe literal O (79₁₀ / 117₈ / 4F₁₆) (case sensitive)

Non-Capturing Group(?:\s?[-+*°.1-9]){1,4}

{1,4}repeats the group contents below between 1 and 4 times:

\s?optionally matches a Unicode whitespace character

Character Class[-+*°.1-9]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

°the literal ° (176₁₀ / 260₈ / B0₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

1-9one character from 1 (49₁₀) to 9 (57₁₀)

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\b(?:SO|OS|O[HS]|[SO])(?:\s?[-+*°.1-9]){1,4}

New

O 4 2 -
O 2 - 
SO 4 * - 2 
S 2- 


"OO", "SS", and "SH" (and even things like "OOOOOOOO")