Regular Expressions 101

Pro

1st Alternative^(?:[^C\n]|C[^V\n]|CV[^S\n]|CVS.).*

^start of line

Non-Capturing Group(?:[^C\n]|C[^V\n]|CV[^S\n]|CVS.)

1st Alternative[^C\n]

Negated Character Class[^C\n]

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

\na line-feed (newline) character (ASCII 10)

2nd AlternativeC[^V\n]

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

Negated Character Class[^V\n]

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

\na line-feed (newline) character (ASCII 10)

3rd AlternativeCV[^S\n]

CVthe literal text CV (case sensitive)

Negated Character Class[^S\n]

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

\na line-feed (newline) character (ASCII 10)

4th AlternativeCVS.

CVSthe literal text CVS (case sensitive)

.any Unicode character (except for line terminators)

.*any Unicode character (except for line terminators), repeated any number of times

2nd Alternative^CV?$

^start of line

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

V?optionally matches the literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

$end of line

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

Ready to run

25 tokens

^(?:[^C\n]|C[^V\n]|CV[^S\n]|CVS.).*|^CV?$