Regular Expressions 101

Pro

Positive Lookahead(?=\d+\s*[hm]\b)

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

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

Character Class[hm]

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

\ba Unicode word boundary

Non-Capturing Group(?:(\d+)\s*h)?

?repeats the group contents below at most once:

Group 1(\d+)

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

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

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

Non-Capturing Group(?:\s*(\d+)\s*m)?

?repeats the group contents below at most once:

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

Group 2(\d+)

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

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

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

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

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25 tokens

(?=\d+\s*[hm]\b)(?:(\d+)\s*h)?(?:\s*(\d+)\s*m)?

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