Help with Regular Expression

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This topic contains 1 reply, has 2 voices, and was last updated by  Carter Shanklin 1 year, 4 months ago.

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    Topic
  • #43680

    Zin Zin
    Participant

    I am trying to import some weblog data into hive table. I have not worked with regular expression. Can some one please point me to a good tutorial on regular expression ?

    I have seen a example like

    CREATE EXTERNAL TABLE logs_20120101 (
    host STRING,
    identity STRING,
    user STRING,
    time STRING,
    request STRING,
    status STRING,
    size STRING)
    ROW FORMAT SERDE ‘org.apache.hadoop.hive.contrib.serde2.RegexSerDe’
    WITH SERDEPROPERTIES (
    “input.regex” =
    “([^ ]*) ([^ ]*) ([^ ]*) (-|\\[[^\\]]*\\]) ([^ \”]*|\”[^\”]*\”) (-|[0-9]*) (-|[0-9]*)”,
    “output.format.string”=”%1$s %2$s %3$s %4$s %5$s %6$s %7$s”
    )
    STORED AS TEXTFILE LOCATION ‘/data/logs/20120101/';

    The sample weblog I have is

    “6466.6668.666868” “US” “Buy” “Movie” “Enter the Dragon”
    “6688.6668.779779” “CA” “Rent” “Movie” “Matrix”

    The DDL I will be creating for the Hive table is

    CREATE EXTERNAL TABLE logs_20120101 (
    host STRING,
    country STRING,
    action STRING,
    category STRING,
    title STRING
    )
    ROW FORMAT SERDE ‘org.apache.hadoop.hive.contrib.serde2.RegexSerDe’
    WITH SERDEPROPERTIES (
    “input.regex” =

    “output.format.string”=”%1$s %2$s %3$s %4$s %5$s”
    )

    I want some help in writing the input regular expression

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  • #43704

    Carter Shanklin
    Participant

    Paulie, first thing to note is the RegexSerDe uses Java style regexes underneath the covers, there are many different styles of RegEx so it’s important to know which one you’re working with.

    This tutorial is pretty good:

    http://www.vogella.com/articles/JavaRegularExpressions/article.html

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