The following can be used to manipulate and retrieve details from variables.

'''Each of these functions can be used with a variable as follows:'''

 . ''varName.method''

The .method at the end is how you will specify which function you are using. Using the table below, you could for example find out the 4th letter of the variable named var that has  stored the word "hello" like so:
 {{{
// Don't forget almost all internal programming stuff that counts starts at 0, not at 1...
// so the 5th character would actually be 0, 1, 2, 3, 4 <--- 4! 
var="hello"
echo var.charAt(4)

Result:
01:25:34 The 5th letter in the word hello is: o
01:25:35 Script stopped
}}}

'''Methods'''
||<tablewidth="796px" tableheight="123px"#cccccc>'''Method ''' ||<#cccccc>'''Type''' ||<#cccccc>'''Description ''' ||||<style="text-align:center"> ||
||charAt ||String ||Returns the character in the position specified by the index parameter. ||
||charCodeAt ||Number ||Returns the numeric Unicode character code of the character at the specified index. ||
||concat ||String ||Appends the supplied arguments to the end of the String object, converting them to strings if necessary, and returns the resulting string. ||
||fromCharCode ||String ||Returns a string comprising the characters represented by the Unicode character codes in the parameters. ||
||indexOf ||int ||Searches the string and returns the position of the first occurrence of val found at or after startIndex within the calling string. ||
||lastIndexOf ||int ||Searches the string from right to left and returns the index of the last occurrence of val found before startIndex. ||
||localeCompare ||int ||Compares the sort order of two or more strings and returns the result of the comparison as an integer. ||
||match ||Array ||Matches the specifed pattern against the string. ||
||replace ||String ||Matches the specifed pattern against the string and returns a new string in which the first match of pattern is replaced with the content specified by repl. ||
||search ||int ||Searches for the specifed pattern and returns the index of the first matching substring. ||
||slice ||String ||Returns a string that includes the startIndex character and all characters up to, but not including, the endIndex character. ||
||split ||Array ||Splits a String object into an array of substrings by dividing it wherever the specified delimiter parameter occurs. ||
||substr ||String ||Returns a substring consisting of the characters that start at the specified startIndex and with a length specified by len. ||
||substring ||String ||Returns a string consisting of the character specified by startIndex and all characters up to endIndex - 1. ||
||toLocaleLowerCase ||String ||Returns a copy of this string, with all uppercase characters converted to lowercase. ||
||toLocaleUpperCase ||String ||Returns a copy of this string, with all lowercase characters converted to uppercase. ||
||toLowerCase ||String ||Returns a copy of this string, with all uppercase characters converted to lowercase. ||
||toUpperCase ||String ||Returns a copy of this string, with all lowercase characters converted to uppercase. ||
||valueOf ||String ||Returns the primitive value of a String instance. ||

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ScriptVariables