Regular Expression To Check For Repeating Numbers

A regular expression to match repeating digits in a given number. Can be used to check if a number or string has duplicated digits.

/([0-9])\1+/g

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Matches:

• 12333
• 111111
• abc111def

Non-matches:

• 123123
• aaa
• abc123abc

See Also:

• Regex To Match Characters Repeated More Than A Specified Number Of Times
• Regex To Match Consecutive Occurrences Of The Same Character In A String