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Home/ Questions/Q 448951
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T21:43:15+00:00 2026-05-12T21:43:15+00:00

Can someone tell me what the syntax for a regex would be that would

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Can someone tell me what the syntax for a regex would be that would only allow the following characters:

  • a-z (lower case only)
  • 0-9
  • period, dash, underscore

Additionally the string must start with only a lower case letter (a-z) and cannot contain any spaces or other characters than listed above.

Thank you in advance for the help,
Justin

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  1. Editorial Team
    Editorial Team
    2026-05-12T21:43:16+00:00Added an answer on May 12, 2026 at 9:43 pm

    You can do: "^[a-z][-a-z0-9\._]*$"

    Here is the breakdown

    • ^ beginning of line
    • [a-z] character class for lower values, to match the first letter
    • [-a-z0-9\._] character class for the rest of the required value
    • * zero or more for the last class
    • $ end of String
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