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en:instr [2016/08/04 09:23] admin [History] |
en:instr [2016/08/13 08:59] admin |
===== Instr (Function) ===== | ===== Instr (Function) ===== |
==== Format ==== | ==== Format ==== |
**instr** ( //haystack_expr// , //needle_expr// )\\ | **instr** ( [[stringexpressions|haystack_string_expression]] , [[stringexpressions|needle_string_expression]] )\\ |
**instr** ( //haystack_expr// , //needle_expr// , //start_expr// )\\ | **instr** ( [[stringexpressions|haystack_string_expression]] , [[stringexpressions|needle_string_expression]] , [[integerexpressions|start_expression]] )\\ |
**instr** ( //haystack_expr// , //needle_expr// , //start_expr// , //boolean_expr//)\\ | **instr** ( [[stringexpressions|haystack_string_expression]] , [[stringexpressions|needle_string_expression]] , [[integerexpressions|start_expression]] , [[booleanexpressions|boolean_expression]])\\ |
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returns //positive_integer_value// | returns [[integerexpressions|integer_expression]] |
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==== Description ==== | ==== Description ==== |
Check to see if the string //needle_expr// is contained in the string //haystack_expr//. If it is, then this function will return the index of starting character of the first place where //needle_expr// occurs. Otherwise, this function will return 0. | Check to see if the string [[stringexpressions|needle_string_expression]] is contained in the string [[stringexpressions|haystack_string_expression]]. If it is, then this function will return the index of starting character of the first place where [[stringexpressions|needle_string_expression]] occurs. Otherwise, this function will return 0. |
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You may optionally specify a starting location for the search to begin //start_expr//. If the start is 1 or greater the search will begin from the specified character from the start. If the start is < 0 then the search will begin from the nth character from the end. The search will ALWAYS look forward. | You may optionally specify a starting location for the search to begin [[integerexpressions|start_expression]]. If the start is 1 or greater the search will begin from the specified character from the start. If the start is < 0 then the search will begin from the nth character from the end. The search will ALWAYS look forward. |
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An optional //boolean_expr// may be used to specify that the search will treat upper and lower case letters the same. | An optional [[booleanexpressions|boolean_expression]] may be used to specify that the search will treat upper and lower case letters the same. |
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==== Note ==== | ==== Note ==== |