regex - regular expression for a serial number -

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i have long payload , need return serial number has many serial numbers , want return serial number after tag. here payload:

usb:  usb 2.0 superspeed bus:    host controller location: building      internal card reader:        product id: 0x8406       serial number: 000000000820 //i dont want       building: yes  usb 2.0 bus:    pci id: 0x8c31        iphone:        vendor id: 0x05ac  (skyway inc.)       version: 7.02       serial number: wea0aa752ada7722ac92575e98z2e89c691f4282 //i want       speed: 492 mb/sec       rec id: 0x11100000 / 1      skyway internal keyboard / trackpad:        product id: 0x0162       recog id: 0x05ac  (skyway inc.)       location id: 0x14c00000 / 3       current available (ma): 500       built-in: yes

how can build regular expression return me following:

wea0aa752ada7722ac92575e98z2e89c691f4282

i tried doing following return expressions start serial number:

serial number: [0-9]

i want serial number shows after iphone title. 

\\biphone:[\\s\\s]*?\\bserial number: (\\w+)

try , grab group 1.see demo.

https://regex101.com/r/hf7zz1/5

for group 

for (nstextcheckingresult *match in matches) { //nsrange matchrange = [match range]; nsrange matchrange = [match rangeatindex:1]; nsstring *matchstring = [htmlstring substringwithrange:matchrange]; nslog(@"%@", matchstring); }

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