Regular Expressions 101

Negative Lookbehind(?<!\b)

\ban ASCII word boundary

#the literal # (35₁₀ / 43₈ / 23₁₆)

Negative Lookahead(?![!])

Character Class[!]

!the literal ! (33₁₀ / 41₈ / 21₁₆)

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

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.

Search reference

Regular Expression

(?<!\b)#(?![!]).*

New

#!bin/bash

# kom
" # nie kom"
${zmienna#.?}
polecenie #komentarz
polecenie#komentarz