Regular Expressions 101

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/
(traffic|bot|website)-?(bot|traffic|website|4free)
/
gm
1st Capturing Group
(traffic|bot|website)
1st Alternative
traffic
traffic
matches the characters traffic literally (case sensitive)
2nd Alternative
bot
bot
matches the characters bot literally (case sensitive)
3rd Alternative
website
website
matches the characters website literally (case sensitive)
-
matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
2nd Capturing Group
(bot|traffic|website|4free)
1st Alternative
bot
bot
matches the characters bot literally (case sensitive)
2nd Alternative
traffic
traffic
matches the characters traffic literally (case sensitive)
3rd Alternative
website
website
matches the characters website literally (case sensitive)
4th Alternative
4free
4free
matches the characters 4free literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String