regex101: openweathermap rain and snow

Positive Lookbehind(?<="3h":|"3h":)

1st Alternative"3h":

"3h":the literal text "3h": (case sensitive)

2nd Alternative"3h":

"3h":the literal text "3h": (case sensitive)

Group 1((d+)|\d+\.\d+)

1st Alternative(d+)

Group 2(d+)

d+the literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive), repeated at least once

2nd Alternative\d+\.\d+

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Positive Lookahead(?=) — does not consume characters

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Search reference

Regular Expression

(?<="3h":|"3h":)((d+)|\d+\.\d+)(?=)

New

{"city":{"id":1217734,"name":"Boysun","findname":"BOYSUN","country":"UZ","coord":{"lon":67.198608,"lat":38.206108},"zoom":8,"langs":[{"link":"http:\/\/en.wikipedia.org\/wiki\/Boysun"},{"ru":"Бойсун"}]},"time":1394871628,"main":{"temp":274.74,"temp_min":274.74,"temp_max":274.74,"pressure":823.92,"sea_level":1035.91,"grnd_level":823.92,"humidity":98},"wind":{"speed":0.6,"deg":97.004},"clouds":{"all":92},"weather":[{"id":804,"main":"Clouds","description":"overcast clouds","icon":"04d"}],"rain":{"3h":0.1},"snow":{"3h":0.85}}