Regular Expressions 101

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/
"businessPhones":\[("?)("?)(?<businPhone>.*?)("?)("?)\].*?,"mobilePhone":("?)(?<mobile>.*?)("?),.*?"userPrincipalName":("?)(?<userPname>.*?)("?),
/
gm
"businessPhones":
matches the characters "businessPhones": literally (case sensitive)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
1st Capturing Group
("?)
"
matches the character " with index 3410 (2216 or 428) literally (case sensitive)
2nd Capturing Group
("?)
"
matches the character " with index 3410 (2216 or 428) literally (case sensitive)
Named Capture Group businPhone
(?<businPhone>.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
4th Capturing Group
("?)
"
matches the character " with index 3410 (2216 or 428) literally (case sensitive)
5th Capturing Group
("?)
"
matches the character " with index 3410 (2216 or 428) literally (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
,"mobilePhone":
matches the characters ,"mobilePhone": literally (case sensitive)
6th Capturing Group
("?)
"
matches the character " with index 3410 (2216 or 428) literally (case sensitive)
Named Capture Group mobile
(?<mobile>.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
8th Capturing Group
("?)
"
matches the character " with index 3410 (2216 or 428) literally (case sensitive)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
.
matches any character (except for line terminators)
"userPrincipalName":
matches the characters "userPrincipalName": literally (case sensitive)
9th Capturing Group
("?)
Named Capture Group userPname
(?<userPname>.*?)
11th Capturing Group
("?)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String