Regular Expressions 101

Pro

Group 1(B\d{4}\.\w+)?

?repeats the group contents below at most once:

Bthe literal B (66₁₀ / 102₈ / 42₁₆) (case sensitive)

\d{4}a digit, repeated exactly 4 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

.any character (except for line terminators)

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.

25 tokens

(B\d{4}\.\w+)?.

New

Cat dog sheep /* 67 = 123 + monkey12 abcd and then a fish B1234.CAT_DOG and half a loaf of bread /* ON INNER JOIN B3456.BIRD_SHOE 11

\1

Cat dog sheep /* 67 = 123 + monkey12 abcd and then a fish B1234.CAT_DOG and half a loaf of bread /* ON INNER JOIN B3456.BIRD_SHOE 11