Difference between revisions of "LlSubStringIndex"
Eren Padar (talk | contribs) |
(whitespace, it's a feature of good code. Changed the snippets to work on an empty needle.) |
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</lsl> | </lsl> | ||
'''Basic Example:''' | |||
<lsl> | <lsl>integer index = llSubStringIndex("string data","TEST"); | ||
if(index == -1) { | |||
integer | llSay(0),"TEST was not found in the string"); | ||
if( | } else { | ||
else{llSay(0,"TEST was found in the string.");} | llSay(0,"TEST was found in the string."); | ||
}</lsl> | |||
</lsl> | |||
|helpers= | |helpers= | ||
Tests to see if one string contains a copy of another: | Tests to see if one string contains a copy of another: | ||
| Line 57: | Line 55: | ||
</lsl> | </lsl> | ||
<lsl> | <lsl>integer startswith(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex | ||
integer startswith(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex | |||
{ | { | ||
return llDeleteSubString(haystack, llStringLength(needle), -1) == needle; | |||
} | }</lsl> | ||
</lsl> | |||
<lsl> | <lsl>integer endswith(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex | ||
integer endswith(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex | |||
{ | { | ||
return llDeleteSubString(haystack, 0, ~llStringLength(needle)) == needle; | |||
} | }</lsl> | ||
</lsl> | |||
Note: Some of the snippets above return a result without ever calling llSubStringIndex. | Note: Some of the snippets above return a result without ever calling llSubStringIndex. | ||
| Line 75: | Line 69: | ||
2. Clever & smaller (calculates contains in ~54 bytes rather than ~60): | 2. Clever & smaller (calculates contains in ~54 bytes rather than ~60): | ||
<lsl> | <lsl>integer contains(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex | ||
integer contains(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex | |||
{ | { | ||
return ~llSubStringIndex(haystack, needle); | return ~llSubStringIndex(haystack, needle); | ||
} | }</lsl> | ||
</lsl> | |||
Note: The llSubStringIndex function returns -1 only when not found and the ~ operator returns zero only for -1, so the clever combination ~llSubStringIndex returns zero only for not found, else nonzero for found. | Note: The llSubStringIndex function returns -1 only when not found and the ~ operator returns zero only for -1, so the clever combination ~llSubStringIndex returns zero only for not found, else nonzero for found. | ||
Revision as of 12:51, 6 September 2008
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Summary
Function: integer llSubStringIndex( string source, string pattern );| 181 | Function ID |
| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns an integer that is the index of pattern in source.
| • string | source | |||
| • string | pattern |
If pattern is not found in source, -1 is returned.
The index of the first character in the string is 0
Caveats
- Performs a literal match (case sensitive).
- Wildcards and RegEx are not supported.
- Attempting to match an empty string ("") will return 0 instead of -1.
- There is no function to search the string from the end or search starting at a specific offset.
Examples
Matching against last names: <lsl> default {
state_entry()
{
llSensorRepeat("", NULL_KEY, AGENT, PI, 96.0, 20);
}
sensor(integer NumDet)
{
integer i;
//Loop through all the sensor data and match against " Linden",
//this causes it to match with any last name of Linden (since there can't be spaces before the firstname)
//Alternatively you could match a firstname with "FirstName "
for(i = 0; i < NumDet; ++i)
if(~llSubStringIndex(llDetectedName(i), " Linden"))
llInstantMessage(llDetectedKey(i), "Hello, I see you!");
}
} </lsl>
Basic Example: <lsl>integer index = llSubStringIndex("string data","TEST"); if(index == -1) {
llSay(0),"TEST was not found in the string");
} else {
llSay(0,"TEST was found in the string.");}</lsl>
Useful Snippets
Tests to see if one string contains a copy of another:
1. Concise & conventional:
<lsl> integer contains(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex {
return 0 <= llSubStringIndex(haystack, needle);
} </lsl>
<lsl>integer startswith(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex {
return llDeleteSubString(haystack, llStringLength(needle), -1) == needle;
}</lsl>
<lsl>integer endswith(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex {
return llDeleteSubString(haystack, 0, ~llStringLength(needle)) == needle;
}</lsl>
Note: Some of the snippets above return a result without ever calling llSubStringIndex.
2. Clever & smaller (calculates contains in ~54 bytes rather than ~60):
<lsl>integer contains(string haystack, string needle) // http://wiki.secondlife.com/wiki/llSubStringIndex {
return ~llSubStringIndex(haystack, needle);
}</lsl>
Note: The llSubStringIndex function returns -1 only when not found and the ~ operator returns zero only for -1, so the clever combination ~llSubStringIndex returns zero only for not found, else nonzero for found.
Note: Smaller was not noticeably faster or slower when our Code Racer and Efficiency Tester harnesses measured the expression { contains("wiki.secondlife.com", "wiki"); }.
See Also
Functions
| • | llListFindList | – | Find a list in another list | |
| • | llGetSubString | – | Copy out part of a string of characters |
Deep Notes
Search JIRA for related Issues
Signature |
|---|
function integer llSubStringIndex( string source, string pattern ); |