How to select rows that contain specific words

[cphd]

I have a list of company names and I would like to subtract the rows with certain company names and create a new file. As company names are given in capital (WALMART), lowercase(walmart), hyphen in the middle (Wal-Mart) or mixed with other words (WALMART SUPERMARKET), I need multiple words to include. Basically, I want the observations that contain 'WALMART' or any similar word in it. 

Company

Walmart

WALMART

Wal-MART

WALMART SUPERMARKET

WALMART PHARMACY

I ran the code below, but it didn't work. 

20 data all.walmart;
21 set all.retailstore;
22 if findw(company,'WALMART')>0;
23 if findw(company,'walmart')>0 ;
24 if findw(company,'Walmart')>0 ;
25 if findw(company,'Wal-mart')>0 ;
26 if findw(company,'WAL-MART')>0 ;
27 run;

[PaigeMiller]

if findw(company,'WALMART',' ','i')>0;

This searches ignoring case.

but since there can be a hyphen in the company name

if findw(company,'WALMART',' ','i')>0 or findw(company,'WAL-MART',' ','i')>0;

Or maybe this: (UNTESTED)

if findw(compress(company,,'p'),'WALMART',' ','i');

[r_behata · Accepted solution]

/*? Quantifier — Matches between zero and one times*/
data all.walmart;;
	set all.retailstore;
	if prxmatch('/wal-?mart/io',company);
run;