Regular Expressions 101

Group 1( # Group 1 \( # Opening bracket ( # Group 2 (?: # Non-capturing group [^()] # Match anything except opening or closing parentheses | # Or (?1) # Repeat Group 1 )* # Repeat the non-capturing group zero or more times ) # End of group 2 \) # Closing bracket )

Comment: Group 1

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Comment: Opening bracket

Group 2( # Group 2 (?: # Non-capturing group [^()] # Match anything except opening or closing parentheses | # Or (?1) # Repeat Group 1 )* # Repeat the non-capturing group zero or more times )

Comment: Group 2

Non-Capturing Group(?: # Non-capturing group [^()] # Match anything except opening or closing parentheses | # Or (?1) # Repeat Group 1 )*

*repeats the group contents below any number of times:

1st Alternative # Non-capturing group [^()] # Match anything except opening or closing parentheses

Comment: Non-capturing group

Negated Character Class[^()]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Comment: Match anything except opening or closing parentheses

2nd Alternative # Or (?1) # Repeat Group 1

Comment: Or

(?1)calls group 1 as a subroutine

Comment: Repeat Group 1

Comment: Repeat the non-capturing group zero or more times

Comment: End of group 2

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Comment: Closing bracket

Global pattern flags

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(                 # Group 1
   \(              # Opening bracket
      (            # Group 2
         (?:       # Non-capturing group
            [^()]  # Match anything except opening or closing parentheses
         |         # Or
            (?1)   # Repeat Group 1
         )*        # Repeat the non-capturing group zero or more times
      )            # End of group 2
   \)              # Closing bracket
)

Test String
New

(user email ends with "@email.com" and user name is "John") or ((user email ends with "@domain.com" and user name is "Bob") or (user id is 5))

Regular Expression

Test StringNew

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Test String
New

Extraction
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