Regular expression imesh and timesheet

[TG]

hello,

i wan't to write a regular expression who match imesh but no match
tIMESHeet. How can i do that ?



thank you

 

[TG]

You mean, match a single word only?

Use the boundary matching tag \b

print "Match!" if /\bimesh\b/;

not exactly, here an example of that i want :


imesh -> match
timessheet -> not match
myimeshsite -> match

Thank you

 

[Glenn Jackman]

hello,

i wan't to write a regular expression who match imesh but no match
tIMESHeet. How can i do that ?

A simple way is to just use 2 expressions. There's surely a clever RE,
but it may not improve readability.

if ($str =~ /imesh/i and $str !~ /timesheet/i) {
# do something
}

 

[TG]

A simple way is to just use 2 expressions. There's surely a clever RE,
but it may not improve readability.

if ($str =~ /imesh/i and $str !~ /timesheet/i) {
# do something
}

sorry, but i want one expression

 

[ed]

sorry, but i want one expression

Something like this should do:

$str =~ /(?<!t)imesh(?!eet)/;

I haven't tested it so I'm not sure it will work, but it's probably
close anyway.

Read this page under the "extended patterns" section:

http://www.perldoc.com/perl5.8.0/pod/perlre.html

--ed

 

[Jay Tilton]

: Glenn Jackman wrote:
: >
: >>i wan't to write a regular expression who match imesh but no match
: >>tIMESHeet. How can i do that ?
: >
: > A simple way is to just use 2 expressions. There's surely a clever RE,
: > but it may not improve readability.
: >
: > if ($str =~ /imesh/i and $str !~ /timesheet/i) {
: > # do something
: > }
: >
: sorry, but i want one expression

Why?

Do you have a subroutine that only accepts a regex argument?
Modifying that subroutine may be a better idea than trying to conform
to its expectations.

Are you planning to use a Perl regex in something besides a Perl
program? You might get something you can't use.

Anyway,

m/(??<=(t))|(?<!t))imesh(?(1)(?!eet))/
^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^
Man, that's f'ed up, but it's the best I could come up with to make
the conditional pattern at the end work, without spending too much
time on it.

Two match operations is definitely the less nauseating approach.