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Home/ Questions/Q 3428502
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Editorial Team
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Editorial Team
Asked: May 18, 20262026-05-18T06:58:00+00:00 2026-05-18T06:58:00+00:00

To use regex syntax in sed, you have to put in \ before (

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To use regex syntax in sed, you have to put in \ before (, {, etc. to use them as special characters. For example:

~ > echo 123 | sed 's/[0-9]{2}/x/'
123

vs.

~ > echo 123 | sed 's/[0-9]\{2\}/x/'
x3

This is the reverse of what I’m used to. Is there any way to make characters have special meanings by default?

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  1. Editorial Team
    Editorial Team
    2026-05-18T06:58:01+00:00Added an answer on May 18, 2026 at 6:58 am

    Try:

    echo 123 | sed -r 's/[0-9]{2}/x/'
    
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