Ant-contrib Tasks: PropertySelector

# PropertySelector

Selects property names that match a given regular expression and returns them in a delimited list

## Parameters

Attribute | Description | Required
--- | --- | ---
property | The name of the property you wish to set. | Yes.
override | If the property is already set, should we change it's value. Can be `true` or `false` | No. Defaults to `false`
match | The regular expression which is used to select property names for inclusion in the list. This follows the standard regular expression syntax accepted by ant's regular expression tasks. | Yes.
select | A pattern which indicates what selection pattern you want in the returned list. This used the substitution pattern syntax to indicate where to insert groupings created as a result of the regular expression match. | No. default is "\0".
casesensitive | Should the match be case sensitive | No. default is "true".
delimiter | The delimiter used to seperate entries in the resulting property | No. default is ",".
distinct | Should the returned entries be a distinct set (no duplicate entries) | No. default is "false".

## Select expressions

Expressions are selected in a the same syntax as a regular expression substitution pattern.

- `\0` indicates the entire property name (default).
- `\1` indicates the first grouping
- `\2` indicates the second grouping
- etc...

## Example

The following code

        <property name="package.ABC.name" value="abc pack name" />
        <property name="package.DEF.name" value="def pack name" />
        <property name="package.GHI.name" value="ghi pack name" />
        <property name="package.JKL.name" value="jkl pack name" />

        <propertyselector property="pack.list"
                             delimiter=","
                             match="package\.([^\.]*)\.name"
                             select="\1"
                             casesensitive="false" />

would yield the results

        ABC,DEF,GHI,JKL

You could then iterate through this list using the ForEach Task as follows:

        <foreach list="${pack.list}"
                    delimiter=","
                    target="print.name"
                    param="pack.id" />

        <target name="print.name" >
          <propertycopy name="pack.name" value="package.${pack.id}.name" />
          <echo message="${pack.name}" />
        </target>

Would print

          [echo] abc pack name
          [echo] def pack name
          [echo] ghi pack name
          [echo] jkl pack name

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