Regex Generator

Regex Validation for Consecutive Zeros

This guide provides a regex pattern to validate strings by ensuring they do not contain two consecutive zeros ("00"). It includes a regex pattern, explanation, and example usage in BigQuery for effective string validation.


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Prompt

two consecutive 00 should not come in big query

Answer

Regular Expression to Validate Two Consecutive '00'

Requirement Overview

We need to create a regex pattern that will validate a string ensuring that there are no occurrences of "00" (two consecutive zeros). This regex should be suitable for use in BigQuery.

Key Elements

  1. Consecutive Characters: We want to specifically target the pattern "00".
  2. String Validation: Ensure the entire string does not contain "00".

Constructing the Regular Expression

To ensure that the string does not contain "00":

  • We can use negative lookahead assertions to ensure "00" does not appear in any part of the string.

Regex Pattern

The regex pattern is:

^(?!.*00).*$

Explanation

  • ^: Asserts the start of the string.
  • **(?!.*00)**: A negative lookahead that asserts what follows must not match the pattern. This part means that "00" should not be present anywhere in the string.
    • .*: Matches any character (except for line terminators) zero or more times.
    • 00: The specific pattern we want to avoid.
  • .*$: Matches any character zero or more times until the end of the string, ensuring the entire string is processed.

Usage Guidance in BigQuery

To use this regex in a BigQuery SQL query, you can utilize the REGEXP_CONTAINS function for string validation. Here’s an example:

SELECT *
FROM your_table
WHERE NOT REGEXP_CONTAINS(your_column, '00')

This query will return all rows where your_column does not contain two consecutive zeros.

Conclusion

By using the regex ^(?!.*00).*$, you ensure that your strings are validated against the requirement of not having consecutive "00". This method is efficient and straightforward for implementation in BigQuery.

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Description

This guide provides a regex pattern to validate strings by ensuring they do not contain two consecutive zeros ("00"). It includes a regex pattern, explanation, and example usage in BigQuery for effective string validation.

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