Regular Expressions 101

Group 1(\b(?!process)\w*EventHandler)

\ban ASCII word boundary

Negative Lookahead(?!process)

processthe literal text process (case insensitive)

\w*any word character, repeated any number of times

EventHandlerthe literal text EventHandler (case insensitive)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 2([^)]*)

Negated Character Class[^)]*

*matches any number of characters outside the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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

Regular Expression

(\b(?!process)\w*EventHandler)\(([^)]*)\)

New

loginEventHandler(err, result)
processEventHandler(loginEventHandler, err, result)
eventHandler(err, result)
appInitEventHandler(err, result)
initProcessEventHandler(err, result)
initprocessEventHandler(err, result)
generic(e, r)

Substitution

processEventHandler($1, $2)