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# Check for a match
if (/pat/) {
...
while (/pat/g) {
   ...
}

print( 'abc' =~ /b/      ?1:0,"\n");  # 1
print( 'abc' =~ /^b\z/   ?1:0,"\n");  # 0
...
print( 'a2b3c' =~ /(\d)/     ?$1:0,"\n");  # 2
print( 'a2b3c' =~ /^.*(\d)/  ?$1:0,"\n");  # 3
print( 'a2b3c' =~ /^.*?(\d)/ ?$1:0,"\n");  # 2