For a number of different transform types, you can specify the limits at which any match is valid for a text string. In the diagram below, you can see how six different positional identifiers can be applied to pattern matching:
NOTE: Depending on the type of transform, some of these clauses are not available.
Positioning
Figure: Pattern Clause Positioning
| Position Parameter | Description | Example |
|---|---|---|
after | Identifies pattern or string after which the match is evaluated. |
Extracts: |
from | Identifies pattern or string from which the match is evaluated. Any match includes the from clause pattern or string. |
Extracts: |
before | Identifies pattern or string before which the match is evaluated. |
Extracts: |
to | Identifies pattern or string up to which the match is evaluated. Any match includes the to clause pattern or string. |
Extracts: |
on | Identifies pattern or string in which the match may be found. |
Extracts: |
at | Identifies the index of starting (x) and ending (y) characters in the string to match. In the above example, at:2,6 matches the string like. |
Extracts:
|
Pattern Parameter Interactions
The following table identifies the pattern parameters that can be matched with the parameter in the left column.
NOTE: The at parameter does not interact with any of the listed parameters.
| Parameter | after | from | before | to | on |
|---|---|---|---|---|---|
after | See Note 1. | No. | before or to | before or to | Yes. Can include before. |
from | No. | See Note 1. | before or to | before or to | No. |
before | after or from | after or from | See Note 1. | No. | Yes. Can include after. |
to | after or from | after or from | No. | See Note 1. | No. |
on | Yes. Can include before. | No. | Yes. Can include after. | No. |
- Note 1: If there is no other pattern parameter in the transform, the maximum number of matches per cell is 1. If there is a matching parameter, more matches per cell can be found.
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