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use variable in regexp

Posted on 2008-06-19
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Last Modified: 2008-06-20
So I have a working regular expression that does what I want.  The problem is that I need to insert a variable into the regexp.  The code is attached.  How do I get the second code snippet to work.
WORKS
<script type="text/javascript">
  var re = /(\b)(glossary term)(?![^<]*>|[^<]*<\/a>)/g;
  var sourcestring = 'aglossary term <a href="page.aspx">glossary term</a> glossary term <test glossary term test> glossary term';
  var replacementpattern = '$1<a href="glossary.aspx#$2" title="def" class="glossary">$2</a>';
  var result = sourcestring.replace(re, replacementpattern);
  alert("result = " + result);
</script>
 
DOES NOT WORK
<script type="text/javascript">
  var word="glossary term";
  var re = new RegExp("(\b)("+word+")(?![^<]*>|[^<]*<\/a>)","g");
  var sourcestring = 'aglossary term <a href="page.aspx">glossary term</a> glossary term <test glossary term test> glossary term';
  var replacementpattern = '$1<a href="glossary.aspx#$2" title="def" class="glossary">$2</a>';
  var result = sourcestring.replace(re, replacementpattern);
  alert("result = " + result);
</script>

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Question by:mattjp88
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7 Comments
 
LVL 82

Expert Comment

by:hielo
ID: 21826148
Try:
var re = new RegExp("(\\b)("+word+")(?![^<]*>|[^<]*<\\/a>)","g");

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Author Comment

by:mattjp88
ID: 21826173
no dice
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LVL 82

Expert Comment

by:hielo
ID: 21826348
What part is not working. Both seem to be alerting the same value
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LVL 6

Author Comment

by:mattjp88
ID: 21826411
in FF 3 it alerts 2 different values
<script type="text/javascript">
  var re = /(\b)(glossary term)(?![^<]*>|[^<]*<\/a>)/g;
  var sourcestring = 'aglossary term <a href="page.aspx">glossary term</a> glossary term <test glossary term test> glossary term';
  var replacementpattern = '$1<a href="glossary.aspx#$2" title="def" class="glossary">$2</a>';
  var result = sourcestring.replace(re, replacementpattern);
  alert("result = " + result);
</script>
 
<script type="text/javascript">
  var word="glossary term";
  var re = new RegExp("(\b)("+word+")(?![^<]*>|[^<]*<\/a>)","g");
  var sourcestring = 'aglossary term <a href="page.aspx">glossary term</a> glossary term <test glossary term test> glossary term';
  var replacementpattern = '$1<a href="glossary.aspx#$2" title="def" class="glossary">$2</a>';
  var result = sourcestring.replace(re, replacementpattern);
  alert("result = " + result);
</script>

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LVL 82

Accepted Solution

by:
hielo earned 2000 total points
ID: 21826822
This is what I tried:
<script type="text/javascript">
  var re = /(\b)(glossary term)(?![^<]*>|[^<]*<\/a>)/g;
  var sourcestring = 'aglossary term <a href="page.aspx">glossary term</a> glossary term <test glossary term test> glossary term';
  var replacementpattern = '$1<a href="glossary.aspx#$2" title="def" class="glossary">$2</a>';
  var result = sourcestring.replace(re, replacementpattern);
  alert("result = " + result);
</script>
 
<script type="text/javascript">
  var word="glossary term";
  var re = new RegExp("(\\b)("+word+")(?![^<]*>|[^<]*<\\/a>)","g");
  var sourcestring = 'aglossary term <a href="page.aspx">glossary term</a> glossary term <test glossary term test> glossary term';
  var replacementpattern = '$1<a href="glossary.aspx#$2" title="def" class="glossary">$2</a>';
  var result = sourcestring.replace(re, replacementpattern);
  alert("result = " + result);
</script>

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Author Comment

by:mattjp88
ID: 21826983
Don't know what I did before, but your code works.  Thanks!!
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LVL 82

Expert Comment

by:hielo
ID: 21831099
You are welcome!
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