Regular Expressions 101

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/
^ *[\-\*_] *[\-\*_] *[\-\*_][\-\*_ \t]*$
/
g
^ asserts position at start of the string
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Match a single character present in the list below
[\-\*_]
\- matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
\* matches the character * with index 4210 (2A16 or 528) literally (case sensitive)
_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Match a single character present in the list below
[\-\*_]
\- matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
\* matches the character * with index 4210 (2A16 or 528) literally (case sensitive)
_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Match a single character present in the list below
[\-\*_]
\- matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
\* matches the character * with index 4210 (2A16 or 528) literally (case sensitive)
_ matches the character _ with index 9510 (5F16 or 1378) literally (case sensitive)
Match a single character present in the list below
[\-\*_ \t]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\- matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
\* matches the character * with index 4210 (2A16 or 528) literally (case sensitive)
_
matches a single character in the list _ (case sensitive)
\t matches a tab character (ASCII 9)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String