Perl regular expressions

[Alona]

Hello All,

We need to extract from a text a 3-digit numbers surrounded by certain
text. For example, we need to extract 199 surrounded by "MESSAGE TYPE"
and "SYSTEM/INPUT":

MESSAGE TYPE 199 SYSTEM/INPUT

What would be Perl regular expression for this?

Thank you,
Alona

 

[J. Gleixner]

Hello All,

We need to extract from a text a 3-digit numbers surrounded by certain
text. For example, we need to extract 199 surrounded by "MESSAGE TYPE"
and "SYSTEM/INPUT":

MESSAGE TYPE 199 SYSTEM/INPUT

What would be Perl regular expression for this?

This is regular expression 101. What have you tried?

 

[Martijn Lievaart]

Hello All,

We need to extract from a text a 3-digit numbers surrounded by certain
text. For example, we need to extract 199 surrounded by "MESSAGE TYPE"
and "SYSTEM/INPUT":

MESSAGE TYPE 199 SYSTEM/INPUT

What would be Perl regular expression for this?

If you read perldoc perlre you would quickly see that this would be

/MESSAGE TYPE (\d+) SYSTEM\/INPUT/

HTH,
M4

 

[Henry Law]

Hello All,

We need to extract from a text a 3-digit numbers surrounded by certain
text. For example, we need to extract 199 surrounded by "MESSAGE TYPE"
and "SYSTEM/INPUT":

MESSAGE TYPE 199 SYSTEM/INPUT

What would be Perl regular expression for this?

$yourtext =~ m!MESSAGE TYPE (\d{3}) SYSTEM/INPUT!;

Now, what is your real question? It will take you a long time to get
your program written one line at a time.

 

[Tad J McClellan]

We need to extract from a text a 3-digit numbers surrounded by certain
text. For example, we need to extract 199 surrounded by "MESSAGE TYPE"
and "SYSTEM/INPUT":

MESSAGE TYPE 199 SYSTEM/INPUT

my $num = substr( $_, index($_, 'SYSTEM/INPUT')-4, 3);

What would be Perl regular expression for this?

Look Ma! No regular expression at all!

 

[Alona]

   my $num = substr( $_, index($_, 'SYSTEM/INPUT')-4, 3);


Look Ma! No regular expression at all!

Thank you all. Please notice that we are searching for 199 in a
certain context. We are not interested in finding "MESSAGE TYPE" and
"SYSTEM/INPUT". We are only interested in 199, but the match should
only pick 199's surrounded in the text by MESSAGE TYPE adn SYSTEM/
INPUT.

Thanks,
Alona

 

[Alona]

Thank you all. Please notice that we are searching for 199 in a
certain context. We are not interested in finding "MESSAGE TYPE" and
"SYSTEM/INPUT". We are only interested in 199, but the match should
only pick 199's surrounded in the text by MESSAGE TYPE adn SYSTEM/
INPUT.

Thanks,
Alona- Hide quoted text -

- Show quoted text -

Also, we are not interested in Perl per se, but in perl regular
expression rules

 

[Uri Guttman]

A> Also, we are not interested in Perl per se, but in perl regular
A> expression rules

then ask elsewhere as this newsgroup is about perl. note that most perl
compatible regular expressions engines aren't perl nor compatible.

:-(

uri

 

[A. Sinan Unur]

Don't quote sigs.

Please notice that we are not interested in reading the documentation to
you. We are only interested in discussing questions where the poster has
demonstrated that s/he has put some effort into solving the problem (one
way to demonstrate goodwill is to read and follow the posting guidelines
for this group).

Also, we are not interested in Perl per se, but in perl regular
expression rules

OK, before I thought you were using 'we' in a cooperative sense. Now,
you are freaking me out. Who is 'we'? 'cause in this group we are
definitely only interested in Perl regular expression rules.

Sinan