Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!.*p\.? *o\.? *box)

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

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case insensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

othe literal o (111₁₀ / 157₈ / 6F₁₆) (case insensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

boxthe literal text box (case insensitive)

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

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

25 tokens

^(?!.*p\.? *o\.? *box).*

New

this is a match



this is not a match beause of p.o. box
pobox

this is a match



this is not a match beause of p.o. box
pobox