Regular Expressions 101

Pro

\[?optionally matches the literal [ (91₁₀ / 133₈ / 5B₁₆)

\ba Unicode word boundary

Group 1(\d{2}:\d{2}:\d{2}(?:\.\d+)?)

\d{2}a Unicode decimal digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

\ba Unicode word boundary

]?optionally matches the literal ] (93₁₀ / 135₈ / 5D₁₆)

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{2}:\d{2}:\d{2}(?:\.\d+)?)\b]?

[12:45:34] or [02:05:23.56]
12:45:34 or 02:05:23.56
[12:45:34 or 02:05:23.56]

[\1]

[12:45:34] or [02:05:23.56]
12:45:34 or 02:05:23.56
[12:45:34 or 02:05:23.56]