diff -r 498421ec3665 -r 94be42998f6a data/dictionary.xml
--- a/data/dictionary.xml	Fri Aug 16 13:55:59 2013 +0200
+++ b/data/dictionary.xml	Fri Aug 16 14:09:02 2013 +0200
@@ -1394,12 +1394,23 @@
 		<term abbreviation="RegEx" completeForm="Regular Expression" language="en"/>
 		<term abbreviation="RegExp" completeForm="Regular Expression" language="en"/>
 		<term abbreviation="RE" completeForm="Regular Expression" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				an expression (sequence of characters) which forms a pattern that can be used for string matching –
+				finding occurrences of the pattern in the text or evaluating whether the whole text matches the pattern;
+				Example: regular expression (a|b)cde\d+ matches strings acde123 or bcde0 but not cde1 or acdex
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>
 		<term abbreviation="PCRE" completeForm=" Perl Compatible Regular Expressions" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a C library for regular expressions compatible with Perl's RegEx dialect
+				or this dialect itself
+			</text>
+		</explanation>
 		<tag>computer</tag>
 	</concept>
 	<concept>