Regular Expressions 101

Pro

Negative Lookbehind(?<!System\.debug.*)

Systemthe literal text System (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

debugthe literal text debug (case sensitive)

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

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negative Lookahead(?!.*System\.debug)

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

Systemthe literal text System (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

debugthe literal text debug (case sensitive)

Negated Character Class[^'\n]*

*matches any number of characters outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\na line-feed (newline) character (ASCII 10)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

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.

26 tokens

Regular Expression

(?<!System\.debug.*)'(?!.*System\.debug)[^'\n]*'

System.debug 'one' and 'two' and 'three' etc.
'one' and 'two' and 'three' etc. System.debug
'one' and System.debug 'two' and 'three'
'one' and 'two' and 'three'