Regular Expressions 101

Pro

\ba Unicode word boundary

upthe literal text up (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Non-Capturing Group(?:(?:\d+\s+days,)?\s*\d{1,2}:\d{1,2}|\d+\s+min)

1st Alternative(?:\d+\s+days,)?\s*\d{1,2}:\d{1,2}

Non-Capturing Group(?:\d+\s+days,)?

?repeats the group contents below at most once:

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

\s+a Unicode whitespace character, repeated at least once

days,the literal text days, (case sensitive)

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

\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times

2nd Alternative\d+\s+min

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

\s+a Unicode whitespace character, repeated at least once

minthe literal text min (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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

\bup\s+(?:(?:\d+\s+days,)?\s*\d{1,2}:\d{1,2}|\d+\s+min)\b

New

15:22:04 up 45 days,  2:34,  2 users,  load average: 0.94, 1.17, 1.37
            15:30:12 up 21 min,  2 users,  load average: 1.56, 1.18, 1.18
            15:30:39 up 15:30,  1 user,  load average: 0.27, 0.40, 0.48

Substitution

15:22:04 up 45 days,  2:34,  2 users,  load average: 0.94, 1.17, 1.37
            15:30:12 up 21 min,  2 users,  load average: 1.56, 1.18, 1.18
            15:30:39 up 15:30,  1 user,  load average: 0.27, 0.40, 0.48