Regular Expressions 101

Pro

\ba Unicode word boundary

configthe literal text config (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1([\w.]+)

Character Class[\w.]+

+matches at least one character from the set below:

\wa Unicode word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?![(\w])

Character Class[(\w]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

\wa Unicode word character

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.

25 tokens

Regular Expression

\bconfig\.([\w.]+)(?![(\w])

New

config.hello.world should match hello.world
config.hello should match hello
config.hello.world( should match hello
config.hello.world*10 should match hello.world