Match start or end of text
creates a pattern that
matches the start or end of text. pat
= textBoundarytextBoundary
can be negated using the
~
operator. When negated, textBoundary
matches
between every character except at the start or end of the text.
contains
| extract
| lineBoundary
| lookAheadBoundary
| lookBehindBoundary
| pattern
| split