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'

Substitution

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'