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Comment or Pragma at The Start of a Line with Leading Whitespace
^
\s
*
#
.
*
$
Options: ^ and $ match at line breaks
Assert position at the start of the string or after a line break character
Match a character that is a "whitespace character" (spaces, tabs, line breaks, etc.)
Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Match the character "#" literally
Match any single character that is not a line break character
Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Assert position at the end of the string or before a line break character
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