string
- ascii
- bit_length
- btrim
- char
- char_length
- concat
- concat_ws
- difference
- hextoraw
- [insert function](function/insert function)
- left
- locate
- lower
- lpad
- ltrim
- octet_length
- quote_ident
- rawtohex
- regexp_like
- regexp_replace
- regexp_substr
- repeat
- replace
- right
- rpad
- rtrim
- soundex
- space
- stringdecode
- stringencode
- stringtoutf8
- substring
- to_char
- translate
- trim
- upper
- utf8tostring
- xmlattr
- xmlcdata
- xmlcomment
- xmlnode
- xmlstartdoc
- xmltext