Examples of RegexParser

cascading.operation.regex.RegexParser
Class RegexParser is used to extract a matched regex from an incoming argument value.
Sometimes its useful to parse out a value from a key/value pair in a string, if the key exists. If the key does not exist, returning an empty string instead of failing is typically expected.
The following regex can extract a value from {@code key1=value1&key2=value2} if key1 exists, otherwise anempty string is returned:
```
(?<=key1=)[^&]*|$
```

Examples of cascading.operation.regex.RegexParser

    Tap sink = getPlatform().getTextFile( "output", SinkMode.REPLACE );


    Pipe pipe = new Pipe( "test" );


    String regex = TestConstants.APACHE_COMMON_REGEX;
    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip", "time", "method", "event", "status", "size" ), regex,
      new int[]{1, 2, 3, 4, 5, 6} ) );


    pipe = new Each( pipe, AssertionLevel.STRICT, new AssertNotNull() );


    pipe = new Each( pipe, new Fields( "method" ), new RegexFilter( "^POST" ) );

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