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+IRC3
+===============
+
+**IRC3** (_**I**ndexation par **R**echerche et **C**omparaison de **C**haînes de **C**aractères_ = indexing by search and comparison of character strings) is a simple and robust programme to search and extract from a corpus of text files the fixed expressions — as chemicals, scientific names of animals or plants, author names, etc. — belonging to a finite list. 
+
+**N.B.**: the list of terms and the different texts must be in **UTF-8** (without [BOM](https://fr.wikipedia.org/wiki/Indicateur_d%27ordre_des_octets)). 
+
+### Usage
+```
+    IRC3.pl -t table -r directory [ -e extension ]* [ -s output_file ] [ -l log ] [ -cq ]
+    IRC3.pl -t table -f input_file [ -s output_file ] [ -l log ] [ -cq ]
+    IRC3.pl -t table [ -e extension ]* [ -s output_file ] [ -l log ] [ -cq ]
+    IRC3.pl -h
+```
+
+### Options
+```
+    -c  considers the letter case (uppercase/lowercase) of searched 
+        terms 
+    -e  indicates the the extension (e.g. “.txt”) of the text files to 
+        process (you can have several extensions by repeating that 
+        option) 
+    -f  indicates the name of the input file to process 
+    -h  displays that help 
+    -l  indicates the name of the log file in which the number of found
+        terms and occurrences is recorded
+    -q  suppresses the display of the work progression (especially for 
+        use in a script shell) 
+    -r  indicates the directory containing the files to be processed 
+    -s  indicates the name of the output file  
+    -t  indicates the name of the file contining the resource, i.e. the 
+        list of searched terms  
+```
+
+### Resource
+
+The resource file contains one line per term. You can indicates the preferential form of a term by adding it at the end of the line after one or more tab characters. 
+
+Empty lines or lines starting with the “#” character are not considered. Moreover, the resource may be a file compressed by `gzip` or `bzip2`.
+
+### Result
+
+The output file contains one line per found occurrence. Each line is formed of 4 tab-separated fields which are respectively:
+
+* the name of the processed file  (“STDIN” for the standard input), 
+* the term as it is in the resource, 
+* the term as it appears in the analysed text, 
+* the preferential form in the case of a synonym.