Vyhľadávanie informácií

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Presentation transcript:

Vyhľadávanie informácií Regulárne výrazy Vyhľadávanie informácií Michal Laclavík

http://regex.info/ http://www.regular-expressions.info/tutorial.html All info http://regex.info/ http://www.regular-expressions.info/tutorial.html

Replacing text in multiple files Extracting URL Crawler obmedzenia Real Problems ^(From|Subject): Parsing not valid XML Replacing text in multiple files sed -i 's/200[0-9]\{7\}/2005102901/' ./* Extracting URL <a href=“([^”]+)”>(.+)</a> Crawler obmedzenia .+\.stuba\.sk .*sav(ba)?\.sk Vyhľadávanie informácií Bratislava, 8. november 2010

Egrep ‘q[^u]’ word.list Special Characters ^cat$, ^$, ^ ^$ nematchuju žiadny znak iba pozíciu gr[ea]y Egrep ‘q[^u]’ word.list Not match Qantas, Iraq Iraqi Iraquian miqra qasida zaqqum Vyhľadávanie informácií Bratislava, 8. november 2010

Gray|grey, gr(a|e)y, gr[ae]y only one char Special Characters 03.19.76 better 03[-./]19[-./]76 Lottery #: 19 203319 7639 Email problem v.i.a.g.r.a Gray|grey, gr(a|e)y, gr[ae]y only one char Wrong gr[a|e]y, gra|ey (First|1st) [Ss]treet (Fir|1)st [Ss]treet ^From|Subject|Date: ^(From|Subject|Date): [fF][rR][oO][mM] egrep –i ‘^(From|Subject|Date):’ mailbox Vyhľadávanie informácií Bratislava, 8. november 2010

Special char egrep [^x] colou?r July 4th , Jul 4 \<cat\> word boundary if implemented [^x] Hocico okrem x (aj prazny riadok) Nieco co nie je x (nieco tam musi byt) colou?r color, colour, semicolon July 4th , Jul 4 (July|Jul), July? 4(th)? Vyhľadávanie informácií Bratislava, 8. november 2010

From|Subject – celý string po zátvorky Platnost From|Subject – celý string po zátvorky iba jeden znak alebo v zátvorkách Colou?r <h[1-6] *> <hr +size *= *[0-9]+ *> <hr( +size *= *[0-9]+ )?*> [a-fA-F0-9] – hexa decimalne Vyhľadávanie informácií Bratislava, 8. november 2010

Chcem najst rovnake slova (e.g. the the) Backreference and dot Chcem najst rovnake slova (e.g. the the) \<the the\> (the theory), \<the +the\> \<([a-z]+) + \1\> \1 \2 \3 podla zatvoriek Dot ega.att.com Matchne aj “megawatt computing” ega\.att\.com \([a-z]+\), matchne “(very)” Vyhľadávanie informácií Bratislava, 8. november 2010

Does not have to match anything 10,05 SK (lepsi priklad treba) ? * Does not have to match anything 10,05 SK (lepsi priklad treba) ([0-9]+(,[0-9]+)?) – match 10 at \1 ([0-9]+(,[0-9]+)?) *(Sk|SKK) match 10,05 at \1 URL \<http://[^ ]+\.html?\> Not very good but can be enought Vyhľadávanie informácií Bratislava, 8. november 2010

Slovenský 24 hod aj s počiatočnou nulou Čas, Summary Anglický 9:17 am, 12:30 pm 1?[0-9] alows 19 (1[012]|[1-9]):[0-5][0-9] (am|pm) Slovenský 24 hod aj s počiatočnou nulou ([01]?[0-9]|2[0-3]):[0-5][0-9] ([012]?[0-3]|[01]?[4-9]) Summary – strana 32 - regex.info Vyhľadávanie informácií Bratislava, 8. november 2010

Ontea patterns properties Objekty Príklady Ontea patterns XML http://ontea.cvs.sourceforge.net/viewvc/ontea/OnteaSF/dist/patterns.xml?view=markup Ontea patterns properties http://ontea.cvs.sourceforge.net/viewvc/ontea/OnteaSF/dist/patterns.properties?revision=1.1&view=markup Vyhľadávanie informácií Bratislava, 8. november 2010

Java String patternStr = "b"; Pattern pattern = Pattern.compile(patternStr); // Determine if pattern exists in input CharSequence inputStr = "a b c b"; Matcher matcher = pattern.matcher(inputStr); boolean matchFound = matcher.find(); // true // Get matching string String match = matcher.group(); // b // Get indices of matching string int start = matcher.start(); // 2 int end = matcher.end(); // 3 // the end is index of the last matching character + 1 // Find the next occurrence matchFound = matcher.find(); Vyhľadávanie informácií Bratislava, 8. november 2010

Find Pattern p = Pattern.compile( pattern ); Matcher m = p.matcher( text ); while( m.find( ) ) { String foundString = null; String foundStringFull = m.group().trim(); if (m.groupCount() == 0) { foundString = m.group().trim(); } else { foundString = m.group(1).trim(); } Vyhľadávanie informácií Bratislava, 8. november 2010

Pattern p = Pattern.compile("[^A-Za-z0-9]"); Replace Pattern p = Pattern.compile("[^A-Za-z0-9]"); Matcher m = p.matcher(name); StringBuffer sb = new StringBuffer(); while (m.find()) { m.appendReplacement(sb, "_"); } m.appendTail(sb); name = sb.toString(); Vyhľadávanie informácií Bratislava, 8. november 2010

Pattern p = Pattern.compile( pattern, Pattern.UNICODE_CASE ); java.util.regex.Pattern \p{Lu} - upercase \p{L} - all \b Treba pisat \\b \\. Vyhľadávanie informácií Bratislava, 8. november 2010

PHP function node($xml, $deliminer) { } if (ereg("<$deliminer>(.*)</$deliminer>",$xml, $out)) return $out[1]; else return ""; } Vyhľadávanie informácií Bratislava, 8. november 2010

Perl m/regex/, r/regex/ PHP eger, egeri, ereg_replace, \\ Support Perl m/regex/, r/regex/ PHP eger, egeri, ereg_replace, \\ Java form 1.4 \\ Dot.net Python … Vyhľadávanie informácií Bratislava, 8. november 2010

Ontea Založené na regulárnych výrazoch Podporuje zložené a vnorené patterny GUI na vizualizáciu výsledkov Podpora konverzie eml (emailov) do txt Vyhľadávanie informácií Bratislava, 8. november 2010

Ontea Extraction Model Extraction based on JAVA Regular Expressions Model supports: named backreferences macros Result of extraction is set of Key=>Value pairs Key=>Value pairs (Results) are further processed Extraction patterns are defined in XML (we have XSD Schema) Macros can be used unlimited times in any pattern Macros in macros (any level) Results can be enhanced by GATE annotations (e.g. gazetteer lookups) Macros could be used to create new patterns only by clicking Vyhľadávanie informácií Bratislava, 8. november 2010

Ontea Extraction Model Address and product patterns Extraction Processing 3 words macro ZIP macro Street number macro Street name macro City name macro Country macro Address patterns Vyhľadávanie informácií Bratislava, 8. november 2010

Skúška email URL Číslo (peniaze) PSČ mesto Firma Vyhľadávanie informácií Bratislava, 8. november 2010