FILE_BASENAME - Return the basename of a file path.
FILE_DIRNAME - Return the dirname of a file path.
I18N_MULTIBYTETOUTF8 - Convert multibyte to UTF8.
I18N_MULTIBYTETOWIDECHAR - Convert multibyte to UTF-16, wide-character (Unicode).
I18N_UTF8TOMULTIBYTE - Convert UTF-8 to multibyte .
I18N_WIDECHARTOMULTIBYTE - Convert UTF-16, wide-character (Unicode) to multibyte.
IDL_BASE64 - Convert between byte arrays and MIME Base64 encoded scalar strings.
READS - Perform formatted input/output from a string variable.
STRCMP - Compare two strings.
STRCOMPRESS - Remove whitespace from a string.
STREGEX - Perform regular expression matching.
STRING - Convert arguments to string type.
STRJOIN - Collapse a string scalar or array into merged strings.
STRLEN - Return the length of a string.
STRLOWCASE - Convert a string to lower case.
STRMATCH - Compare search string against input string expression.
STRMID - Extract a substring from a string.
STRPOS - Find first occurrence of a substring within a string.
STRPUT - Insert the contents of one string into another.
STRSPLIT - Split its input string argument into separate substrings, according to the specified pattern.
STRTRIM - Remove leading and/or trailing blanks from string.
STRUPCASE - Convert a string to upper case.