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Tokens

Note! This site is about Perl 6.
If you are looking for a solution for the current production version of Perl 5, please check out the Perl 5 tutorial.

tutorial/regex2/tokens.p6

use v6;

# Let's see something else
my $good = 'this_is_a_long_variable = 456 + 789';
my $bad  = 'this_is_a_long_variable = 456 +';

for $good, $bad -> $exp {
    if $exp ~~ m/:s ^ \w+ \= \d+ \+ \d+ $/ {
        say "Match: $exp";
    }
}

# mark the quantifyers as not backtracking

# m/:s ^ \w+: \= \d+: \+ \d+: $/ {

# or use the :ratchet modifier to set all the 
# quantifiers non-backtracking

# m/:s :ratchet ^ \w+ \= \d+ \+ \d+ $/ {

# and there is a special name for this called token

my token sentence { ^ \w+ \= \d+ \+ \d+ $ }



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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01


Prev: Rules

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