从ＨＴＭＬ文件找出需要的字符串

fttskyblue

源文件如下，
<ul><li><a href="/Education_Report_1.html" target="_blank">[ <font color=#E43026>Education Report</font> ] </a> <a href="/lrc/201005/se-ed-teen-mothers-13may10.lrc" target=_blank><img src=/images/lrc.gif border=0></a> <a href="/VOA_Special_English/A-Class-Where-Teens-Learn-Mothering-37218_1.html" target="_blank"><img src=/images/yi.gif border=0></a> <a href="/VOA_Special_English/A-Class-Where-Teens-Learn-Mothering-37218.html" target="_blank">A Class Where Teens Learn Mothering, and Are Mothered  (2010-5-13)</a></li><li><a href="/The_Making_of_a_Nation_1.html" target="_blank">[ <font color=#E43026>The Making of a Nation</font> ] </a>  <a href="/VOA_Special_English/-Immigrants-from-Europe-Seek-Better-Life-in-New-Land-37217.html" target="_blank">American History: Immigrants from Europe Seek a Better Life in a New Land  (2010-5-13)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Birth-Control-Pill-Sparked-Contraceptive-Revolution-37233.html" target="_blank">Birth Control Pill Sparked Contraceptive Revolution  (2010-5-13)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Expectations-High-for-Nigerias-New-Leader-37232.html" target="_blank">Expectations High for Nigeria's New Leader  (2010-5-13)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/In-Malawi-NGOs-and-Government-Join-Forces-to-End-Forced-Marriage--37231.html" target="_blank">In Malawi, NGOs and Government Join Forces to End Forced Marriage   (2010-5-13)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Indonesian-Trade-With-China-Rises-Despite-Fears-of-Tough-Competition--37230.html" target="_blank">Indonesian Trade With China Rises, Despite Fears of Tough Competition   (2010-5-13)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Obama-Karzai-Discuss-Tensions-Affirm-Partnership-37227.html" target="_blank">Obama, Karzai Discuss Tensions, Affirm Partnership  (2010-5-13)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Plane-Crash-in-Libya-Kills--37226.html" target="_blank">Libyan Plane Crash Kills 103, Child Survives   (2010-5-13)</a></li><li><a href="/Learn_A_Word_1.html" target="_blank">[ <font color=green>Learn A Word</font> ] </a> <a href="/Voa_English_Learning/Learn_A_Word_37242.html" target="_blank">976: massive; 977 makeshift; 978 overlap; 979 priceless; 980 calorie  (2010-5-13)</a></li><li><a href="/Popular_American_1.html" target="_blank">[ <font color=green>Popular American</font> ] </a> <a href="/Voa_English_Learning/Popular_American_37236.html" target="_blank">330 in one's elemment...  (2010-5-13)</a></li><li><a href="/Words_And_Idioms_1.html" target="_blank">[ <font color=green>Words And Idioms</font> ] </a> <a href="/Voa_English_Learning/Words_And_Idioms_37239.html" target="_blank">498 gung ho...  (2010-5-13)</a></li><li><a href="/Business_Etiquette_1.html" target="_blank">[ <font color=green>Business Etiquette</font> ] </a> <a href="/Voa_English_Learning/Business_Etiquette_37237.html" target="_blank">106 Fitness Program 2   (2010-5-13)</a></li><li><a href="/Bilingual_News_1.html" target="_blank">[ <font color=green>Bilingual News</font> ] </a> <a href="/Voa_English_Learning/Bilingual_News_37223.html" target="_blank"> Libya Plane Crash Kills 103, Child Survives   (2010-5-13)</a></li><li><a href="/Bilingual_News_1.html" target="_blank">[ <font color=green>Bilingual News</font> ] </a> <a href="/Voa_English_Learning/Bilingual_News_37222.html" target="_blank"> New British PM, Deputy Hail 'Historic and Seismic' Political Shift    (2010-5-13)</a></li><li><a href="/Word_Master_1.html" target="_blank">[ <font color=green>Wordmaster</font> ] </a> <a href="/Voa_English_Learning/Word_Master_37241.html" target="_blank">With Pronouns, Our Brains Don't Always Know What They're Talking About  (2010-5-13)</a></li><li><a href="/Sports_English_1.html" target="_blank">[ <font color=green>Sports English</font> ] </a> <a href="/Voa_English_Learning/Sports_English_37240.html" target="_blank">038  冬季两项 - Biathlon    (2010-5-13)</a></li><li><a href="/Go_English_1.html" target="_blank">[ <font color=green>Go English</font> ] </a> <a href="/Voa_English_Learning/Go_English_37238.html" target="_blank">009C 购物: 高级课程   (2010-5-13)</a></li><li><a href="/Health_Report_1.html" target="_blank">[ <font color=#E43026>Health Report</font> ] </a> <a href="/lrc/201005/se-health-India-obesity-11may10.lrc" target=_blank><img src=/images/lrc.gif border=0></a> <a href="/VOA_Special_English/Obesity-Becomes-a-Big-Killer-in-India-37219.html" target="_blank">Obesity Becomes a Big Killer in India  (2010-5-12)</a></li><li><a href="/Explorations_1.html" target="_blank">[ <font color=#E43026>Explorations</font> ] </a>  <a href="/VOA_Special_English/Music-Would-not-be-the-Same-Without-the-Guitar-37203.html" target="_blank">Guitar Heroes, Before Anyone Even Heard of a Video Game  (2010-5-12)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Millions-of-Women-in-Childbirth-Newborns-Dying-37215.html" target="_blank">Many Maternal, Infant Deaths Preventable Using Low-Tech Methods  (2010-5-12)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Indian-and-Pakistani-Foreign-Ministers-To-Hold-Talks-In-Mid-July--37210.html" target="_blank">Indian, Pakistani Foreign Ministers to Hold Talks in Mid July   (2010-5-12)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Drone-Strike-Kills-at-Least--in-Northwest-Pakistan--37206.html" target="_blank">US Missile Strikes Kill 24 in NW Pakistan   (2010-5-12)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/US-Support-for-Democracy-Key-to-Improving-Muslim-Relations-37204.html" target="_blank">US Support for Democracy Key to Improving Muslim Relations  (2010-5-12)</a></li><li><a href="/Bilingual_News_1.html" target="_blank">[ <font color=green>Bilingual News</font> ] </a> <a href="/Voa_English_Learning/Bilingual_News_37221.html" target="_blank"> Russia Warns Middle East Situation Worsening   (2010-5-12)</a></li><li><a href="/Bilingual_News_1.html" target="_blank">[ <font color=green>Bilingual News</font> ] </a> <a href="/Voa_English_Learning/Bilingual_News_37220.html" target="_blank"> Pledges Long-term US Commitment to Afghanistan   (2010-5-12)</a></li><li><a href="/Agriculture_Report_1.html" target="_blank">[ <font color=#E43026>Agriculture Report</font> ] </a> <a href="/lrc/201005/se-ag-kenya-crop-11may10.lrc" target=_blank><img src=/images/lrc.gif border=0></a> <a href="/VOA_Special_English/In-Kenya-Low-Cost-Crop-Insurance-for-Small-Farmers-37201.html" target="_blank">In Kenya, Low-Cost Crop Insurance for Small Farmers  (2010-5-11)</a></li><li><a href="/Science_in_the_News_1.html" target="_blank">[ <font color=#E43026>Science in the News</font> ] </a>  <a href="/VOA_Special_English/Tornado-Season-Returns-37202.html" target="_blank">'Tornado Season' Begins in the United States  (2010-5-11)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Greeks-in-America-React-to-Greek-Financial-Crisis-37199.html" target="_blank">Greeks in America React to Greek Financial Crisis  (2010-5-11)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/US-Government-Agencies-Propose-Spending-Hundreds-of-Millions-of-Dollars-on-Math-and-Science-Educational-Programs-37197.html" target="_blank">US Government Agencies Propose Spending Hundreds of Millions of Dollars on Math and Science Educational Programs  (2010-5-11)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Across-Iraq-Gunmen-Bombers-Strike-Killing--People-37194.html" target="_blank">Attacks in Iraq Kill More Than 100  (2010-5-11)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/decapua-botswana-aids-caregivers-may-37193.html" target="_blank">HIV/AIDS Care Giving Takes Toll  (2010-5-11)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Legendary-American-Entertainer-Lena-Horne-Dies--37191.html" target="_blank">Legendary American Entertainer Lena Horne Dies   (2010-5-11)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Political-Negotiations-in-Britain-Continue--37189.html" target="_blank">Political Negotiations in Britain Continue   (2010-5-11)</a></li><li><a href="/Bilingual_News_1.html" target="_blank">[ <font color=green>Bilingual News</font> ] </a> <a href="/Voa_English_Learning/Bilingual_News_37196.html" target="_blank"> Finance Ministers Agree on Euro Stabilization Package   (2010-5-11)</a></li><li><a href="/Bilingual_News_1.html" target="_blank">[ <font color=green>Bilingual News</font> ] </a> <a href="/Voa_English_Learning/Bilingual_News_37195.html" target="_blank"> in Philippines to Choose New President, Congress   (2010-5-11)</a></li><li><a href="/Development_Report_1.html" target="_blank">[ <font color=#E43026>Development Report</font> ] </a> <a href="/lrc/201005/se-dev-global-entrepreneurship-10may10.lrc" target=_blank><img src=/images/lrc.gif border=0></a> <a href="/VOA_Special_English/US-Launches-Effort-to-Support-Muslim-Entrepreneurs-Around-the-World-37181_1.html" target="_blank"><img src=/images/yi.gif border=0></a> <a href="/VOA_Special_English/US-Launches-Effort-to-Support-Muslim-Entrepreneurs-Around-the-World-37181.html" target="_blank">US Launches Effort to Support Muslim Entrepreneurs Around the World  (2010-5-10)</a></li><li><a href="/This_is_America_1.html" target="_blank">[ <font color=#E43026>This is America</font> ] </a>  <a href="/VOA_Special_English/Lincolns-Cottage-A-Visit-to-a-th-Century-Camp-David-37180.html" target="_blank">Lincoln's Cottage: A Visit to a 19th Century Camp David  (2010-5-10)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/India-Brazil-South-Africa-Lead-Effort-Against-Child-Labor-37187.html" target="_blank">India, Brazil, South Africa, Lead Effort Against Child Labor  (2010-5-10)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Louisiana-Fishermen-Return-to-Check-for-Oil-Spills-Progress-37186.html" target="_blank">Louisiana Fishermen Return to Check for Oil Spill's Progress  (2010-5-10)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Mali-Celebrates-Mask-and-Puppet-Culture-37185.html" target="_blank">Mali Celebrates Mask and Puppet Culture  (2010-5-10)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Shakira-World-Cup-Song-Sparks-Controversy-37184.html" target="_blank">Shakira World Cup Song Sparks Controversy  (2010-5-10)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Stakes-Are-High-Along-the-Louisiana-Coast-37183.html" target="_blank">Stakes Are High Along the Louisiana Coast  (2010-5-10)</a></li><li><a href="/Words_And_Their_Stories_1.html" target="_blank">[ <font color=#E43026>Words And Their Stories</font> ] </a> <a href="/lrc/201005/se-ws-clothing-idioms-pt-2-09may10.lrc" target=_blank><img src=/images/lrc.gif border=0></a> <a href="/VOA_Special_English/Words-and-Their-Stories-More-Clothing-Expressions-37170_1.html" target="_blank"><img src=/images/yi.gif border=0></a> <a href="/VOA_Special_English/Words-and-Their-Stories-More-Clothing-Expressions-37170.html" target="_blank">Words and Their Stories: More Clothing Expressions  (2010-5-9)</a></li><li><a href="/People_in_America_1.html" target="_blank">[ <font color=#E43026>People in America</font> ] </a>  <a href="/VOA_Special_English/Barbara-Jordan---A-Powerful-Voice-for-Justice-and-Social-Change-37169.html" target="_blank">Barbara Jordan, 1936-1996: A Powerful Voice for Justice and Social Change  (2010-5-9)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Experts-on-Terrorism-Say-Time-Square-Suspects-Radicalization-Gradual-37178.html" target="_blank">Experts on Terrorism Say Time Square Suspect's Radicalization Gradual  (2010-5-9)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Goldman-Sachs-to-Review-Firms-Core-Principals-37177.html" target="_blank">Goldman Sachs to Review Firm's Core Principals  (2010-5-9)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/Gulf-Oil-Spill-Shuts-Down--Percent-of-Louisianas-Oyster-Production--37176.html" target="_blank">Gulf Oil Spill Shuts Down 50 Percent of Louisiana's Oyster Production   (2010-5-9)</a></li><li><a href="/VOA_Standard_1.html" target="_blank">[ <font color=#013687>Standard English</font> ] </a>  <a href="/VOA_Standard_English/US-Labor-and-Civil-Rights-Organizations-Call-for-Boycott-Against-Arizona-37174.html" target="_blank">US Labor and Civil Rights Organizations Call for Boycott Against Arizona  (2010-5-9)</a></li></ul>

想得到的输出是所有以日期前的最近的一个html地址，例如，对于第一个要匹配的片断，
<a href="/VOA_Special_English/A-Class-Where-Teens-Learn-Mothering-37218.html" target="_blank">A Class Where Teens Learn Mothering, and Are Mothered  (2010-5-13)
需要得到/VOA_Special_English/A-Class-Where-Teens-Learn-Mothering-37218.html
最后得到的是一个地址列表：
/VOA_Special_English/A-Class-Where-Teens-Learn-Mothering-37218.html
/VOA_Special_English/-Immigrants-from-Europe-Seek-Better-Life-in-New-Land-37217.html

兰花仙子

try the module:

http://search.cpan.org/~petek/HT ... HTML/TreeBuilder.pm