Regular Expressions 101

Pro

intthe literal text int (case sensitive)

\s+any whitespace character, repeated at least once

.*?any character, repeated any number of times

Group 1( \{ # Match opening brace (?: # Start non-capturing group [^{}]++ # Match non-brace chars without backtracking | # OR (?-1) # Recursively match the entire expression )* # Match 0 or more times \} )

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

Comment: Match opening brace

Non-Capturing Group(?: # Start non-capturing group [^{}]++ # Match non-brace chars without backtracking | # OR (?-1) # Recursively match the entire expression )*

*repeats the group contents below any number of times:

1st Alternative # Start non-capturing group [^{}]++ # Match non-brace chars without backtracking

Comment: Start non-capturing group

Negated Character Class[^{}]++

++matches at least one character outside the set below:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

Comment: Match non-brace chars without backtracking

2nd Alternative # OR (?-1) # Recursively match the entire expression

Comment: OR

(?-1)calls group 1 as a subroutine

Comment: Recursively match the entire expression

Comment: Match 0 or more times

\}the literal } (125₁₀ / 175₈ / 7D₁₆)

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

s modifier: single line. Allows a dot to match line terminators

No unit tests · Add a test to get started

25 tokens

Regular Expression

int\s+.*?  (
    \{   # Match opening brace
        (?:         # Start non-capturing group
            [^{}]++ # Match non-brace chars without backtracking
            |       # OR
            (?-1)   # Recursively match the entire expression
        )*          # Match 0 or more times
    \}
)

Unit Tests

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