近来做vb.net+asp.net的项目,对于已经熟悉了Java开发平台的我来说是一种挑战,今天刚好做了有关String处理的东东,先记下来为以后参考.

String Functions

Several built-in string functions perform string manipulations to augment simple concatenation with the "&" operator. These functions are summarized in the following table.

Function	Use
Asc()	Returns the character code of the first character of a string. Asc("A") returns 65.
Chr()	Returns the display character of a character code. Chr(65) returns "A".
GetChar()	Returns the character at a specified position in a string, counting from 1. GetChar("This is a string", 7) returns "s".
InStr()	Returns the starting position in a string of a substring, counting from 1. InStr("This is a string", "string") returns 11.
InStrRev()	Returns the starting position in a string of a substring, searching from the end of the string. InStr("This is a string", "string") returns 11.
LCase()	Returns the lower-case conversion of a string. LCase("THIS IS A STRING") returns "this is a string".
Left()	Returns the left-most specified number of characters of a string. Left("This is a string", 4) returns "This".
Len()	Returns the length of a string. Len("This is a string") returns 16.
LTrim()	Removes any leading spaces from a string. LTrim("   This is a string") returns "This is a string".
Mid()	Returns a substring from a string, specified as the starting position (counting from 1) and the number of characters. Mid("This is a string", 6, 4) returns "is a".
Replace()	Replaces all occurences of a substring in a string. Replace("This is a string", " s", " longer s") returns "This are a longer string" (replaces an "s" preceded by a blank space).
Right()	Returns the right-most specified number of characters of a string. Right("This is a string", 6) returns "string".
RTrim()	Removes any trailing spaces from a string. RTrim("This is a string   ") returns "This is a string".
Str()	Returns the string equivalent of a number. Str(100) returns "100".
Space()	Fills a string with a given number of spaces. "This" & Space(5) & "string" returns "This     string".
StrComp()	Compares two strings. Return values are 0 (strings are equal), 1 (first string has the greater value), or -1 (second string has the greater value) based on sorting sequence. StrComp("This is a string", "This string") returns -1.
StrReverse()	Reverses the characters in a string. StrReverse("This is a string") returns "gnirts a si sihT".
Trim()	Removes any leading and trailing spaces from a string. Trim("   This is a string   ") returns "This is a string".
UCase()	Returns the upper-case conversion of a string. UCase("This is a string") returns "THIS IS A STRING".
Val()	Converts a numeric expression to a number. Val( (1 + 2 + 3)^2 ) returns 36.

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