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VisualREGEXP 2.2Copyright (c) 2000-2001 Laurent Riesterer-------------------------------------------------------------------------------1. What is VisualREGEXP-------------------------------------------------------------------------------VisualREGEXP helps you to design, debug or more generally work with regularexpression. As it is often difficult to write the right regexp at the firsttry, this tool will show you the effect of your regexp on a sample you canchoose.-------------------------------------------------------------------------------2. Requirements-------------------------------------------------------------------------------This program requires Tcl/Tk 8.3.0 or later with the script version.Nothing with the standalone program.-------------------------------------------------------------------------------3. How to use it-------------------------------------------------------------------------------Launching the program=====================On Unix, use 'chmod +x ...' to make the program executable. You can thenintegrate it with your Window Manager or put it into an executable path.On Windows, create a shortcut and invoke the script with 'wish.exe'Design of regexps=================To design regexp, just type the expression in the top text widget.Press the 'Go' button to highlight the matched part of the text in the sampletext widget.To get a quickref of the regexp syntax use the menu 'View/Show regexp help'.You can specify some options using the checkboxes (please read Tcl help tolearn the meaning of these options).Recursive design of regexps===========================Sometimes you will need more than one step to extract the information you wantfrom the sample. For example, imagine you want to retrieve information froman HTML table inside an another HTML table : <html><body> <table border=1> <tr><td> <table bgcolor="#FFFF00" border=1> <tr> <td>One</td> <td>1</td> </tr> <tr> <td>Two</td> <td>2</td> </tr> </table> <tr> <td>Foo</td> <td>Bar</td> </tr> </table> </body></html>You cannot use one global regexp to extract the two lines "One 1" and "Two 2".You have to use a first regexp to narrow the processed region.Type the following regexp '<table bg[^>]*?>(.*?)</table>' and press 'Go'.You see now that the interessing area is shown in blue. Press the Match '1'button which will extract the blue text (the regexp to use to get this textis then printed on the console).Now use '<td>(.*?)</td>.*?<td>(.*?)</td>' to get the information you need.Optimization of regexps=======================When you need to match a list of words, use the menu'Insert regexp/Make regexp' to design an optimized version of the word list.For example, the list 'aa aab ab ad' is optimized into 'a(ab?|b|d)'.Processing the sample text==========================Use can use VisualREGEXP to perform modification of a text.Just use the menu 'Select mode/Use replace'. You can now design a regexp tomatch what you want. Then use the replace text widget to enter the substitutionyou want to apply (use \0, \1, \2, ... to match the subregexp, use the colorto map the number with the matched sub-expressions).After the substitution, you can save the new text using the 'File/Save ...'menu. You can let the program choose the end-of-line format or force them fora specific environment (Unix, Windows, Mac).-------------------------------------------------------------------------------4. Contact-------------------------------------------------------------------------------Send your bug reports, suggestions or any feedback to: mailto:laurent.riesterer@free.fr http://laurent.riesterer.free.fr/regexp⌨️ 快捷键说明
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