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I am generating a long table that has 3 columns. The content of the table contains words that contain underscore such as "ABCD_243_SSD_FCA_SDD" and using the hyphenate package I managed to break the content to the next line when the word does not fit the column width.

The problem is that I get an arrow as the hyphenation character:

enter image description here

How can I replace this arrow with "-" or with whitespace ?

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    Welcome to TeX.SX! Please prepare a small minimal working example (MWE) that allows others to reproduce the output you get and to test possible suggestions.
    – leandriis
    Mar 9 at 19:06
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    Please tell us how the columns are defined. If the column that contains ABCD_243_SSD_FCA_SDD has a fixed width -- e.g., p{2cm} -- you could load the seqsplit package and write \seqsplit{ABCD_243_SSD_FCA_SDD} to force an automaticline break.
    – Mico
    Mar 9 at 19:14
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As you want _ to act like an explict hyphenation point you can tell TeX that is what it is:

enter image description here

\documentclass{article}
\usepackage{array}
\usepackage[T1]{fontenc}
\begin{document}

\begin{tabular}{l>{\raggedright\arraybackslash\catcode`\_12 \hyphenchar\font`\_}p{2cm}}
  aaa & ABCD_243_SSD_FCA_SDD\\
  bbb & ZZZ_1234_THIS_THAT_THING\\
\end{tabular}
\end{document}

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