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05.06.2007 at 09:46PM PDT, ID: 22556012
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6.2

Greedy Regex has me bugged

Asked by sapbucket in C# Programming Language, Perl Programming Language, Regular Expressions

Tags: , ,

[a|A] [h|H][r|R][e|E][f|F]["|=]["|=]?(\w+?\.mpg|\w+?\.wmv)
[a|A] [h|H][r|R][e|E][f|F]["|=]["|=]?[\.\./]?(\w+?\.mpg|\w+?\.wmv)

I am using a regex string to parse html files. There are several variations (strategies) I want to parse. I want to combine them in to one string.

string myRegex = "[a|A] [h|H][r|R][e|E][f|F]["|=]["|=][\.]?[\.]?[/]?(.+\.xls|.+\.dat)";

The goal is to parse every ".xls" and ".dat" file from html.

My test data:

<BODY BGCOLOR="000033" TOPMARGIN="0">
<DIV ALIGN="CENTER"><TABLE WIDTH="805" BORDER="0" CELLSPACING="0" CELLPADDING="0"><TR><TD HEIGHT="41" BGCOLOR="000033"><IMG SRC="images/top-header2.jpg" WIDTH="805" HEIGHT="300" USEMAP="#Map" BORDER="0"><MAP NAME="Map"><AREA SHAPE="rect" COORDS="321,6,500,108" HREF="http://www.elli.com/track/MzoxNTox/"></MAP></TD></TR><TR><TD HEIGHT="2" BGCOLOR="000033"><A HREF="http://join.elli.com/track/MzoxNTox/"><IMG SRC="images/top3.jpg" WIDTH="805" HEIGHT="37" BORDER="0"></A></TD></TR><TR><TD HEIGHT="416" BGCOLOR="#660066"><TABLE WIDTH="805" BORDER="0" CELLSPACING="0" CELLPADDING="0" BGCOLOR="#660066"><TR><TD HEIGHT="241"><DIV ALIGN="CENTER"><A HREF="budget01.xls"><IMG SRC="p1.jpg" WIDTH="400" HEIGHT="300" border="0"></A></DIV></TD><TD HEIGHT="241"><DIV ALIGN="CENTER"><A HREF="budget02.xls"><IMG SRC="p2.jpg" WIDTH="400" HEIGHT="300" border="0"></A></DIV></TD></TR><TR><TD HEIGHT="38"><DIV ALIGN="CENTER"><FONT FACE="Tahoma" SIZE="4"><B><FONT COLOR="#66CC00"

Should output:
matches[0].Groups[1] == "budget01.xls"
matches[1].Groups[1] == "budget02.xls"

But instead outputs:
matches[0].Groups[1]  == "http://join.elli.com/track/MzoxNTox/"><IMG SRC="images/top3.jpg" WIDTH="805" HEIGHT="37" BORDER="0"></A></TD></TR><TR><TD HEIGHT="416" BGCOLOR="#660066"><TABLE WIDTH="805" BORDER="0" CELLSPACING="0" CELLPADDING="0" BGCOLOR="#660066"><TR><TD HEIGHT="241"><DIV ALIGN="CENTER"><A HREF="budget01.xls"><IMG SRC="p1.jpg" WIDTH="400" HEIGHT="300" border="0"></A></DIV></TD><TD HEIGHT="241"><DIV ALIGN="CENTER"><A HREF="budget02.xls"

Why does the regex include too much? I do not understand how to control the "greediness".

I have been struggling to understand how I can correct this. An experts suggestion would be greatly appreciated.

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Zones: C# Programming Language, Perl Programming Language, Regular Expressions
Tags: parse, regex, greedy
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Solution Provided By: mjcoyne
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Solution Grade: A
 
 
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