RegexPrecondition

java.lang.Object
- net.sf.saxon.regex.RegexPrecondition

```
public class RegexPrecondition
extends java.lang.Object
```
A precondition that must be true if a regular expression is to match

Field Summary

Fields
Modifier and Type Field Description

int fixedPosition

int minPosition

Operation operation

Constructor Summary

Constructors
Constructor	Description
`RegexPrecondition(Operation op, int fixedPos, int minPos)`	Create a precondition for a regular expression to be true

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - operation
```
public Operation operation
```
  - fixedPosition
```
public int fixedPosition
```
  - minPosition
```
public int minPosition
```
- Constructor Detail
  - RegexPrecondition
```
public RegexPrecondition(Operation op,
                         int fixedPos,
                         int minPos)
```
    Create a precondition for a regular expression to be true
    
    Parameters:
    
    op - the operation to be performed. The precondition is true if op.iterateMatches(p).hasNext() is true at some position p, subject to the constraints in the other two arguments
    
    fixedPos - indicates that the operation only needs to be tested at this position. Used when all previous parts of the regular expression are fixed length, and the regex starts with a "^" anchor. Defaults to -1, indicating that the operation needs to be tested at every position.
    
    minPos - indicates that the operation needs to be tested at this position and all subsequent positions within the input string (until a match is found or the end of the string is reached). Defaults to 0.