Regular Expressions 101

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/
^(services\.)?carloseo|ohow|list-manage|youtube
/
gm
1st Alternative
^(services\.)?carloseo
^ asserts position at start of a line
1st Capturing Group
(services\.)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
services
matches the characters services literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
carloseo
matches the characters carloseo literally (case sensitive)
2nd Alternative
ohow
ohow
matches the characters ohow literally (case sensitive)
3rd Alternative
list-manage
list-manage
matches the characters list-manage literally (case sensitive)
4th Alternative
youtube
youtube
matches the characters youtube 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

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