String matching pattern -Boundary pattern
| - | - |
|---|---|
| alphanumericBoundary | Matches the boundary between alphanumeric and non-alphanumeric characters |
| digitBoundary | Matches the boundary between digit characters and non-digit characters |
| letterBoundary | Matches the boundary between alphabetic and non-alphabetic characters |
| whitespaceBoundary | Matches the boundary between whitespace and non-whitespace characters |
| lineBoundary | match the beginning or end of a line |
| textBoundary | match the beginning or end of the text |
| lookAheadBoundary | match the boundary before the specified pattern |
| lookBehindBoundary | Boundary after matching the specified pattern |
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