Regular Expressions 101

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/
^(?:.\|){10}(.)\|
/
gm
^ asserts position at start of a line
Non-capturing group
(?:.\|){10}
{10} matches the previous token exactly 10 times
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\| matches the character | literally (case sensitive)
1st Capturing Group
(.)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\| matches the character | 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