What’s the difference between REGEXP in MySQL 5.x and REGEXP in MySQL 8.0 (which uses ICU-based regex)?

Difficulty: 6/10

REGEXP syntax, ICU regex engine, performance

Differences Between REGEXP in MySQL 5.x and MySQL 8.0 (ICU-Based Regex)

MySQL 5.x and MySQL 8.0 use completely different regex engines. MySQL 5.x relies on an older POSIX ERE engine, while MySQL 8.0 uses the far more powerful ICU regex engine. This results in major differences in capability, performance, Unicode handling, and supported syntax.

Key Differences Between MySQL 5.x and MySQL 8.0 REGEXP

1
Regex Engine: MySQL 5.x uses POSIX Extended Regular Expressions (ERE), while MySQL 8.0 uses the ICU (International Components for Unicode) regex engine, which is more modern and feature-rich.
2

What’s the difference between REGEXP in MySQL 5.x and REGEXP in MySQL 8.0 (which uses ICU-based regex)?

Difficulty: 6/10

REGEXP syntax, ICU regex engine, performance

Differences Between REGEXP in MySQL 5.x and MySQL 8.0 (ICU-Based Regex)

Key Differences Between MySQL 5.x and MySQL 8.0 REGEXP

1
Regex Engine: MySQL 5.x uses POSIX Extended Regular Expressions (ERE), while MySQL 8.0 uses the ICU (International Components for Unicode) regex engine, which is more modern and feature-rich.
2

What’s the difference between REGEXP in MySQL 5.x and REGEXP in MySQL 8.0 (which uses ICU-based regex)?

Differences Between REGEXP in MySQL 5.x and MySQL 8.0 (ICU-Based Regex)

What’s the difference between REGEXP in MySQL 5.x and REGEXP in MySQL 8.0 (which uses ICU-based regex)?

Differences Between REGEXP in MySQL 5.x and MySQL 8.0 (ICU-Based Regex)

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Follow-up Questions