The correct regex to remove the first character?

Golfoholic
Golfoholic ⚪️
in Data Platform & Data Science

I have a column( that illustrates a dollar amount but is in string format. What I am trying to do is to remove the dollar sign ($) that is the very first character in each row, so i am only left with the numbers. I have tried the left/right substring but each dollar amount is different length so I have ran in to issues.

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Best Answer

  • MichelleH
    MichelleH 🔵
    Answer ✓

    Hi @user048760 ,

    If the text you want to remove is always the "$" symbol then you could use a Replace Text tile in MagicETL to just remove that character, regardless of the length.

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    Then you would need use an Alter Columns tile to change the datatype of your column from string to a decimal.

Answers

  • GrantSmith
    GrantSmith Indiana 🥷
    edited November 2021 
    REGEXP_REPLACE(`field`,'^\$(.*)$', '$1')


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  • MarkSnodgrass
    MarkSnodgrass Portland, Oregon 🥷

    You should have the formula tile available to you now that Magic ETL 2.0 is live. You can then do this in a formula tile to remove the $ and convert it to a decimal:

    CAST(REPLACE(`fieldname`,'$','') as decimal)


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  • GrantSmith
    GrantSmith Indiana 🥷

    Alternatively you can also use a formula tile to remove the first character by using RIGHT and LENGTH

    RIGHT(`field`, LENGTH(`field`)-1)
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