{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-05-26T00:16:20.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-05-26T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":42810,"title":"String Find with Wildcards of a Cell array","description":"Given a cell array of strings and a search string with single character (?) or multiple character (*) wildness return the indices of the cell array that match.\r\n\r\n*Examples:*\r\n\r\n  {'abc' 'bdce' 'bkcz'},'b?c'  outputs [2 3] 'abc' invalid as ? requires a character\r\n  {'abcdfhjkfd' 'cf' 'fjhkc' 'fdjk'}, 'c*f' outputs [1 2], no char required for * ","description_html":"\u003cp\u003eGiven a cell array of strings and a search string with single character (?) or multiple character (*) wildness return the indices of the cell array that match.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExamples:\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e{'abc' 'bdce' 'bkcz'},'b?c'  outputs [2 3] 'abc' invalid as ? requires a character\r\n{'abcdfhjkfd' 'cf' 'fjhkc' 'fdjk'}, 'c*f' outputs [1 2], no char required for * \r\n\u003c/pre\u003e","function_template":"function idx = stridx(c,str)\r\n% c: cell array of strings\r\n% str: search string with single character ? wild or * multiple wild\r\n% idx: indices of c that contain str\r\n idx=[];\r\n\r\nend","test_suite":"%%\r\nc={'abcdef' '12345' 'matfile.mat' 'fname.xls'};\r\nstr='*.xls';\r\nassert(isequal(stridx(c,str),[4]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'fname.xls'};\r\nstr='xls';\r\nassert(isequal(stridx(c,str),[4]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'abcfname.xls'};\r\nstr='a*f';\r\nassert(isequal(stridx(c,str),[1 3 4]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'abcfname.xls'};\r\nstr='a?f';\r\nassert(isequal(stridx(c,str),[3]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'abcfname.xls'};\r\nstr='1*5';\r\nassert(isequal(stridx(c,str),[2]))\r\n%%\r\nc={'random' 'test.mart' 'rat' 'matfile.mat' 'random.mat' 'matfile'};\r\nstr='.ma*t';\r\nassert(isequal(stridx(c,str),[2 4 5]))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":2,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":16,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-04-20T03:25:42.000Z","updated_at":"2026-05-28T17:32:24.000Z","published_at":"2016-04-20T03:39:15.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a cell array of strings and a search string with single character (?) or multiple character \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e(*\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e) wildness return the indices of the cell array that match.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExamples:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[{'abc' 'bdce' 'bkcz'},'b?c'  outputs [2 3] 'abc' invalid as ? requires a character\\n{'abcdfhjkfd' 'cf' 'fjhkc' 'fdjk'}, 'c*f' outputs [1 2], no char required for *]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"problems":[{"id":42810,"title":"String Find with Wildcards of a Cell array","description":"Given a cell array of strings and a search string with single character (?) or multiple character (*) wildness return the indices of the cell array that match.\r\n\r\n*Examples:*\r\n\r\n  {'abc' 'bdce' 'bkcz'},'b?c'  outputs [2 3] 'abc' invalid as ? requires a character\r\n  {'abcdfhjkfd' 'cf' 'fjhkc' 'fdjk'}, 'c*f' outputs [1 2], no char required for * ","description_html":"\u003cp\u003eGiven a cell array of strings and a search string with single character (?) or multiple character (*) wildness return the indices of the cell array that match.\u003c/p\u003e\u003cp\u003e\u003cb\u003eExamples:\u003c/b\u003e\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003e{'abc' 'bdce' 'bkcz'},'b?c'  outputs [2 3] 'abc' invalid as ? requires a character\r\n{'abcdfhjkfd' 'cf' 'fjhkc' 'fdjk'}, 'c*f' outputs [1 2], no char required for * \r\n\u003c/pre\u003e","function_template":"function idx = stridx(c,str)\r\n% c: cell array of strings\r\n% str: search string with single character ? wild or * multiple wild\r\n% idx: indices of c that contain str\r\n idx=[];\r\n\r\nend","test_suite":"%%\r\nc={'abcdef' '12345' 'matfile.mat' 'fname.xls'};\r\nstr='*.xls';\r\nassert(isequal(stridx(c,str),[4]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'fname.xls'};\r\nstr='xls';\r\nassert(isequal(stridx(c,str),[4]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'abcfname.xls'};\r\nstr='a*f';\r\nassert(isequal(stridx(c,str),[1 3 4]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'abcfname.xls'};\r\nstr='a?f';\r\nassert(isequal(stridx(c,str),[3]))\r\n%%\r\nc={'abcdef' '12345' 'matfile.mat' 'abcfname.xls'};\r\nstr='1*5';\r\nassert(isequal(stridx(c,str),[2]))\r\n%%\r\nc={'random' 'test.mart' 'rat' 'matfile.mat' 'random.mat' 'matfile'};\r\nstr='.ma*t';\r\nassert(isequal(stridx(c,str),[2 4 5]))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":2,"created_by":3097,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":16,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-04-20T03:25:42.000Z","updated_at":"2026-05-28T17:32:24.000Z","published_at":"2016-04-20T03:39:15.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a cell array of strings and a search string with single character (?) or multiple character \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e(*\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e) wildness return the indices of the cell array that match.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eExamples:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[{'abc' 'bdce' 'bkcz'},'b?c'  outputs [2 3] 'abc' invalid as ? requires a character\\n{'abcdfhjkfd' 'cf' 'fjhkc' 'fdjk'}, 'c*f' outputs [1 2], no char required for *]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"errors":[],"facets":[[],[{"value":"easy","count":1,"selected":false}]],"term":"tag:\"wildcard\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}