Regular Expression to match preprocessor directive statement

[parulkalra]

What is Regular Expression for matching Preprocessor directive statements like #include <stdio.h>?

[stampede]

Don't you think one thread about regular expressions is enough ? link to previous thread
I have a feeling that you want us to do your homework.
Please show us what have you tried so far.

[parulkalra]

i tried these code but they are not working :

functionFormat1.setFontItalic(false);
functionFormat1.setForeground(Qt::green);
rule.pattern = QRegExp("\\b#([A-Za-z0-9]+ <>)");
rule.format = functionFormat1;
highlightingRules.append(rule);


functionFormat1.setFontItalic(false);
functionFormat1.setForeground(Qt::green);
rule.pattern = QRegExp("\\b[#]([A-Za-z0-9])");
rule.format = functionFormat1;
highlightingRules.append(rule);

[ChrisW67]

Read the expressions out in plain English (or your fave language) and I think it is obvious why they will not work (for some definition of work):

#include <stdio.h>

#include <stdio.h>

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The first expression reads:

• A word boundary (matched)
• Followed by # (matched)
• Followed by one or more letters from the set [A-Za-z0-9] (matches "include")
• Followed by a single space (matched)
• Followed by a less than symbol (matched)
• Followed by a greater than symbol (NOT MATCHED)

The second expression reads:

• A word boundary (matched)
• Followed by a single character from the set [#] (matched inefficiently)
• Followed by a single character from the the set [A-Za-z0-9] (matches "i")

This matches the input but not the whole input.