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ASP.NET / VB / REGEX: Automatically Make Headings Bold

Posted on 2012-03-30
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Last Modified: 2012-04-01
Using REGEX with ASP.NET / VB, how can I format plain text to make the headings bold?  Text is a heading if:
- It is 100 character or shorter than
- The first and last word begin with a capital letter
- It does not end with a period or a comma or a hyphen or a question mark or a colon
- There are one or more line breaks before it
- There are exactly two line breaks after it

input = RegularExpressions.Regex.Replace(input,  ????, "<strong>???</strong>")

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Hello World

This is a test and only a test.  The heading above should be bold.

This is a Heading!

The heading above should be bold.  If it had ended with a question mark or a period or a comma or a hyphen it should not have been bold.

ALL CAPS HEADING

The heading above should be bold.
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Question by:hankknight
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7 Comments
 
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Expert Comment

by:käµfm³d 👽
ID: 37789507
Try:

input = RegularExpressions.Regex.Replace(input, "(\n)(?=.{1,100}\n)([A-Z][a-z]*(?:(?: [a-z]+)* [A-Z][a-z]*)?)(\r\n\r\n)", "$1<strong>$2</strong>$3")

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 37789513
P.S.

If by "line break" you actually mean an HTML <br /> tag, then you can replace the single \n and the two \r\n with "<br ?/?>":

input = RegularExpressions.Regex.Replace(input, "(<br ?/?>)(?=.{1,100}\n)([A-Z][a-z]*(?:(?: [a-z]+)* [A-Z][a-z]*)?)(<br ?/?><br ?/?>)", "$1<strong>$2</strong>$3")

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Author Comment

by:hankknight
ID: 37792116
Thanks but it is not working for me:


input = "Hello World" + VbNewLine + VbNewLine + "This is a test and only a test.  The heading above should be bold. " + VbNewLine +VbNewLine + "This is a Heading!" + VbNewLine +VbNewLine + "The heading above should be bold.  If it had ended with a question mark or a period or a comma or a hyphen it should not have been bold." + VbNewLine +VbNewLine + "ALL CAPS HEADING" + VbNewLine + VbNewLine + "The heading above should be bold. "
input = RegularExpressions.Regex.Replace(input, "(\n)(?=.{1,100}\n)([A-Z][a-z]*(?:(?: [a-z]+)* [A-Z][a-z]*)?)(\r\n\r\n)", "$1<strong>$2</strong>$3q")
input = RegularExpressions.Regex.Replace(input, VbNewLine + "- ", VbNewLine + "&#8226; ")
input = RegularExpressions.Regex.Replace(input, VbNewLine, VbNewLine +"<br />")
return input

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 37792153
Because you don't have a leading line break. Your requirement said: "There are one or more line breaks before it." Your example does not match this requirement.
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Author Comment

by:hankknight
ID: 37793241
Thanks, but I am still having trouble with it.

"The first and last word begin with a capital letter" however the code below only works if the heading is two words long.

It should make the line bold if the first and last word begin with bold letters but it should not matter if other words inside the heading do not begin with capital letters.

input = VbNewLine + VbNewLine + "Bold Heading One" + VbNewLine + VbNewLine + "This is a test and only a test.  The heading above should be bold." + VbNewLine +VbNewLine + "Heading 2 Should be Bold" + VbNewLine +VbNewLine + "The heading above should be bold.  If it had ended with a question mark or a period or a comma or a hyphen it should not have been bold." + VbNewLine +VbNewLine + "Bold Heading" + VbNewLine + VbNewLine + "The heading above should be bold. "
input = RegularExpressions.Regex.Replace(input, "(\n)(?=.{1,100}\n)([A-Z][a-z]*(?:(?: [a-z]+)* [A-Z][a-z]*)?)(\r\n\r\n)", "$1<strong>$2</strong>$3")
input = RegularExpressions.Regex.Replace(input, VbNewLine + "- ", VbNewLine + "&#8226; ")
input = RegularExpressions.Regex.Replace(input, VbNewLine, VbNewLine +"<br />")
return input

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Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 37793272
I took the requirement, "The first and last word begin with a capital letter," as *only* the first and last letter should be capitalized. It's easy enough to fix, though.

...
input = RegularExpressions.Regex.Replace(input, "(\n)(?=.{1,100}\n)([A-Z][a-z]*(?:(?: [a-zA-Z]+)* [A-Z][a-z]*)?)(\r\n\r\n)", "$1<strong>$2</strong>$3")
...

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Author Comment

by:hankknight
ID: 37793363
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