2.7 String Functions
Warning!
The String functions cannot operate on null arguments.
String Concatenation
Strings are concatenated with the arithmetic '+' operator:
string str1 = string str2 + string str3 ...
strEndsWith
Returns true
if str
ends with substr
, otherwise false
.
boolean strEndsWith ( string str , string substr )
Parameter | Description |
---|---|
| String to examine |
| String to look for |
Returns |
|
strEqualsIgnoreCase
Compares two strings and returns true
if they are equal, and false
if they are not. This comparison ignores case.
boolean strEqualsIgnoreCase ( string str1 , string str2 )
Parameter | Description |
---|---|
| A string to compare |
| Another string to compare |
Returns |
|
strIndexOf
Returns the first position where substr
can be found in str
. If substr
is not found, -1
is returned. The position starts to count from 0 (zero), which is the first character.
int strIndexOf ( string str , string substr, int startIndex ) //Optional
Parameter | Description |
---|---|
| String to examine |
| String to look for |
| Index where to start the string search. If |
Returns | The position of the first character of |
strLastIndexOf
Returns the last position where substr
can be found in str
. If substr
is not found, -1
is returned. The position starts to count from 0 (zero), which is the first character.
int strLastIndexOf ( string str , string substr, int startIndex ) //Optional
Parameter | Description |
---|---|
| String to examine |
| String to look for |
| Index where to start the string search. If |
Returns | The position of the last character of |
strInsert
Inserts a string into another at a specific position, and returns the result string.
string strInsert ( string str1 , int position , string str2 )
Parameter | Description |
---|---|
| The string that |
| The string to insert |
| Position where |
Returns | The result string. Note, the |
strLength
Returns the number of characters in a string.
int strLength( string str )
Parameter | Description |
---|---|
| String to examine |
Returns | The number of characters in the string |
strREContains
Returns true
if a string contains a substring, else false
. The function is case sensitive.
boolean strREContains ( string str , string regexp )
Parameter | Description |
---|---|
| String to examine |
| The substring to look for. Regular expressions are allowed. |
Returns |
|
Note!
Regular expressions according to Java syntax applies. For further information, see http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html.
Warning!
Using nonconstant regular expressions may consume large amounts of memory and should therefore be avoided.
strREIndexOf
Returns the first position where a regular expression can be found in a string. If the regular expression is not found, -1
is returned. The position starts to count from 0 (zero), which is the first character.
int strREIndexOf ( string str , string regexp )
Parameter | Description |
---|---|
| String to examine |
| Regular expression to be used when examining |
Returns | The position of the first character of |
Example - Using strREIndexOf
strREIndexOf( "Hello There!", "[Tt]he" ) // Returns 6
Note!
Regular expressions according to Java syntax applies. For further information, see http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html.
Warning!
Using nonconstant regular expressions may consume large amounts of memory and should therefore be avoided.
strREMatches
Returns true
if the first stated string matches the content of the second string completely. The function is case sensitive.
boolean strREMatches ( string str , string regexp )
Parameter | Description |
---|---|
| The first string |
| The second string. Regular expressions are allowed |
Returns |
|
Example - Using strREMatches
strREMatches( "abc", "ab." )
Will return true
.
strREMatches( "abc", "a..c" )
Will return false
.
strREMatches( "abc", "a[a-z]c" )
Will return true
.
strREMatches( "abc", "a[A-Z]c" )
Will return false
.
strREMatches( numberString, "[0-9]*" )
Will check that the variable numberString
only contain digits. It will return true
for "123" and false
for "123F".
Note!
Regular expressions according to Java syntax applies. For further information, please refer to http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html.
Warning!
Using nonconstant regular expressions may consume large amounts of memory and should therefore be avoided.
strREReplaceAll
Replaces existing substrings within a string with new values.
string strREReplaceAll ( string str , string old , string new )
Parameter | Description |
---|---|
| String to change |
| The substring to replace. Regular expressions are allowed. |
| The new substring to replace the old. If an empty string is entered, the old will be removed without inserting any new value. |
Returns | The result string |
Example - Using strREReplaceAll
string strREReplaceAll ( "flower", "low", "orm" )
This call will change the string "flower" to the string "low". If the new
parameter was left empty ("orm" in this case), the resulting string would have been "fer".
Note!
Regular expressions according to Java syntax applies. For further information, please refer to http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html.
Warning!
Using nonconstant regular expressions may consume large amounts of memory and should therefore be avoided.
strReplaceChars
Replaces characters in a string at a given position with another string and returns the new string. If str2
is longer than str1
, then the resulting string will be expanded to fit the complete str2
.
string strReplaceChars ( string str1 , int position , string str2 )
Parameter | Description |
---|---|
| The base string |
| Position where |
| String to use for replacement |
Returns | The result string. Note, the |
Example - Using strReplaceChars
The following example returns the string: Hi Walter
strReplaceChars("Hi Sister", 3, "Walt");
strSplit
Splits a string where a given regular expression is matched into a list of strings. The function will try to match the regular expression and split the string as many times as possible.
list<string> strSplit ( string str , string regex )
Parameter | Description |
---|---|
| The base string |
| The regular expression which is to be used to split elements |
Returns | A list of strings |
This function would typically be used for splitting strings of values that are comma separated, colon separated, or similar. The list returned will present the substrings in the order they occur in the original string.
Example - Using strSplit
strSplit("one,two,three", ",");
Will return the following list:
one two three
strSplit("name:date:time", ":");
Will return the following list:
name date time
strSplit("person a person b person c", "person ");
Will return the following list:
a b c
strStartsWith
Returns true
if str
starts with substr
, otherwise false
.
boolean strStartsWith ( string str , string substr )
Parameter | Description |
---|---|
| String to examine |
| String to look for |
Returns |
|
strSubstring
Returns a substring from a given string. The extracted substring is from position start
to end
.
string strSubstring ( string str , int start , int end )
Parameter | Description |
---|---|
| The base string |
| Position where to start the substring extraction. Position 0 (zero) points to the first character of |
| Position where to end the extraction. That is, the index of the letter after the last letter in the substring. |
Returns | The substring |
Example - Using strSubstring
The following call returns the string "the".
strSubstring("hi there", 3, 6);
strToLower
Turns all letters in a string to lower-case.
string strToLower( string str )
Parameter | Description |
---|---|
| The base string |
Returns | The result string. Note, the |
strToUpper
Turns all letters in a string to capital letters.
string strToUpper( string str )
Parameter | Description |
---|---|
| The base string |
Returns | The result string. Note, the |
strTrim
Removes leading and trailing spaces from a string and returns the result.
string strTrim( string str )
Parameter | Description |
---|---|
| The base string |
Returns | The result string. Note, the |