Examples of cascading.operation.regex.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=)[^&]*|$
```


    Tap source = getPlatform().getTextFile( new Fields( "offset", "line" ), inputFileApache );


    Pipe pipe = new Pipe( "test" );


    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip" ), "^[^ ]*" ), new Fields( "ip" ) );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );

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    Tap source = getPlatform().getTextFile( new Fields( "offset", "line" ), inputFileApache );


    Pipe pipe = new Pipe( "test" );


    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip" ), "^[^ ]*" ), new Fields( "ip" ) );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );

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      }
    };


    Pipe pipe = new Pipe( "test" );


    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip" ), "^[^ ]*" ), new Fields( "ip" ) );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );

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