Explain how REGEXP_INSTR() differs from LOCATE() and INSTR() functions.

Differences Between REGEXP_INSTR(), LOCATE(), and INSTR() in MySQL

REGEXP_INSTR() provides regex-based pattern searching, while LOCATE() and INSTR() only support literal substring matching.

Key Differences

Pattern Matching: LOCATE() and INSTR() search for fixed text; REGEXP_INSTR() supports full regular expressions.
Search Flexibility: Regex enables matching digits, character classes, Unicode groups, boundaries, repetitions, etc.
Function Options: REGEXP_INSTR() allows selecting match start/end position, specifying occurrence, and using match flags.
Use Cases: Literal searches → LOCATE()/INSTR(); pattern-based or dynamic searches → REGEXP_INSTR().

Literal Search with LOCATE()

Literal Search with INSTR()

Regex Search with REGEXP_INSTR()

Find Second Regex Match

Find Word Boundary Match

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