Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# String functions
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**Topics**
+ [\$1\$1 (Concatenation) operator](r_concat_op.md)
+ [ASCII function](r_ASCII.md)
+ [BPCHARCMP function](r_BPCHARCMP.md)
+ [BTRIM function](r_BTRIM.md)
+ [BTTEXT\$1PATTERN\$1CMP function](r_BTTEXT_PATTERN_CMP.md)
+ [CHAR\$1LENGTH function](r_CHAR_LENGTH.md)
+ [CHARACTER\$1LENGTH function](r_CHARACTER_LENGTH.md)
+ [CHARINDEX function](r_CHARINDEX.md)
+ [CHR function](r_CHR.md)
+ [COLLATE function](r_COLLATE.md)
+ [CONCAT function](r_CONCAT.md)
+ [CRC32 function](crc32-function.md)
+ [DIFFERENCE function](DIFFERENCE.md)
+ [INITCAP function](r_INITCAP.md)
+ [LEFT and RIGHT functions](r_LEFT.md)
+ [LEN function](r_LEN.md)
+ [LENGTH function](r_LENGTH.md)
+ [LOWER function](r_LOWER.md)
+ [LPAD and RPAD functions](r_LPAD.md)
+ [LTRIM function](r_LTRIM.md)
+ [OCTETINDEX function](OCTETINDEX.md)
+ [OCTET\$1LENGTH function](r_OCTET_LENGTH.md)
+ [POSITION function](r_POSITION.md)
+ [QUOTE\$1IDENT function](r_QUOTE_IDENT.md)
+ [QUOTE\$1LITERAL function](r_QUOTE_LITERAL.md)
+ [REGEXP\$1COUNT function](REGEXP_COUNT.md)
+ [REGEXP\$1INSTR function](REGEXP_INSTR.md)
+ [REGEXP\$1REPLACE function](REGEXP_REPLACE.md)
+ [REGEXP\$1SUBSTR function](REGEXP_SUBSTR.md)
+ [REPEAT function](r_REPEAT.md)
+ [REPLACE function](r_REPLACE.md)
+ [REPLICATE function](r_REPLICATE.md)
+ [REVERSE function](r_REVERSE.md)
+ [RTRIM function](r_RTRIM.md)
+ [SOUNDEX function](SOUNDEX.md)
+ [SPLIT\$1PART function](SPLIT_PART.md)
+ [STRPOS function](r_STRPOS.md)
+ [STRTOL function](r_STRTOL.md)
+ [SUBSTRING function](r_SUBSTRING.md)
+ [TEXTLEN function](r_TEXTLEN.md)
+ [TRANSLATE function](r_TRANSLATE.md)
+ [TRIM function](r_TRIM.md)
+ [UPPER function](r_UPPER.md)

String functions process and manipulate character strings or expressions that evaluate to character strings. When the *string* argument in these functions is a literal value, it must be enclosed in single quotation marks. Supported data types include CHAR and VARCHAR. 

The following section provides the function names, syntax, and descriptions for supported functions. All offsets into strings are one-based. 
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**Deprecated leader node-only functions**  
The following string functions are deprecated because they run only on the leader node. For more information, see [Leader node–only functions](c_SQL_functions_leader_node_only.md)
+ GET\$1BYTE
+ SET\$1BIT
+ SET\$1BYTE
+ TO\$1ASCII