Regular Expressions 101

Explanation

Pro

clientName=the literal text clientName= (case sensitive)

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

Positive Lookahead(?=\s*,\s*\w+=|\])

1st Alternative\s*,\s*\w+=

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

\w+any word character, repeated at least once

=the literal = (61₁₀ / 75₈ / 3D₁₆)

2nd Alternative\]

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

clientName=(.*?)(?=\s*,\s*\w+=|\])

New

com.example.sensitive.info.UserInfo@15b1534[name=User1, clientName=HARVARD LAW SCHOOL, THE, clientId=12345]