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Home/ Questions/Q 8373579
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Editorial Team
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Editorial Team
Asked: June 9, 20262026-06-09T14:42:42+00:00 2026-06-09T14:42:42+00:00

How can I use the replace function to add a single character to each

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How can I use the replace function to add a single character to each line in JavaScript using a regular expression?

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  1. Editorial Team
    Editorial Team
    2026-06-09T14:42:43+00:00Added an answer on June 9, 2026 at 2:42 pm

    Use the beginning of line regex:

    // X is the single char to add:
    str = str.replace(/^/gm, "X");
    

    The gm flags cause a match across lines.

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