Regular expression for a JIRA identifier

问题

I'm trying to extract a JIRA identifier from a line of text.

JIRA identifiers are of the form [A-Z]+-[0-9] - I have the following pattern:

foreach my $line ( @textBlock ) {
    my ( $id ) = ( $line =~ /[\s|]?([A-Z]+-[0-9]+)[\s:|]?/ );
    push @jiraIDs, $id if ( defined $id && $id !~ /^$/ );
}

This doesn't cope if someone specifies some text which contains the pattern inside another string - for example blah_blah_ABC-123 would match upon ABC-123. I don't want to mandate that there must be a space or other delimiter in front of the match as that would fail if the identifier were at the start of the line.

Can anyone suggest the necessary runes?

Thanks.

回答1:

You can make sure that character before your pattern is either a whitespace, or the beginning of the string using alternation. Similarly make sure, it is followed by either whitespace or end of the string.

You can use this regex:

my ( $id ) = ( $line =~ /(?:\s|^)([A-Z]+-[0-9]+)(?=\s|$)/ );

回答2:

Official JIRA ID Regex (Java):

Atlassian themselves have a couple webpages floating around that suggest a good (java) regex is this:

((?<!([A-Z]{1,10})-?)[A-Z]+-\d+)

(Source: https://confluence.atlassian.com/display/STASHKB/Integrating+with+custom+JIRA+issue+key)

Test String:
"BF-18 abc-123 X-88 ABCDEFGHIJKL-999 abc XY-Z-333 abcDEF-33 ABC-1"

Matches:
BF-18, X-88, ABCDEFGHIJKL-999, DEF-33, ABC-1

Improved JIRA ID Regex (Java):

But, I don't really like it because it will match the "DEF-33" from "abcDEF-33", whereas I prefer to ignore "abcDEF-33" altogether. So in my own code I'm using:

((?<!([A-Za-z]{1,10})-?)[A-Z]+-\d+)

Notice how "DEF-33" is no longer matched:

Test String:
"BF-18 abc-123 X-88 ABCDEFGHIJKL-999 abc XY-Z-333 abcDEF-33 ABC-1"

Matches:
BF-18, X-88, ABCDEFGHIJKL-999, ABC-1

Improved JIRA ID Regex (JavaScript):

I also needed this regex in JavaScript. Unfortunately, JavaScript does not support the LookBehind (?<!a)b, and so I had to port it to LookAhead a(?!b) and reverse everything:

var jira_matcher = /\d+-[A-Z]+(?!-?[a-zA-Z]{1,10})/g

This means the string to be matched needs to be reversed ahead of time, too:

var s = "BF-18 abc-123 X-88 ABCDEFGHIJKL-999 abc XY-Z-333 abcDEF-33 ABC-1"
s = reverse(s)
var m = s.match(jira_matcher);

// Also need to reverse all the results!
for (var i = 0; i < m.length; i++) {
    m[i] = reverse(m[i])
}
m.reverse()
console.log(m)

// Output:
[ 'BF-18', 'X-88', 'ABCDEFGHIJKL-999', 'ABC-1' ]

回答3:

If you include sample data with your question, you get the best shot at answers from those who might not have Jira, etc.

Here's another take on it-

my $matcher = qr/ (?: (?<=\A) | (?<=\s) )
                  ([A-Z]{1,4}-[1-9][0-9]{0,6})
                  (?=\z|\s|[[:punct:]]) /x;

while ( <DATA> )
{
    chomp;
    my @matches = /$matcher/g;
    printf "line: %s\n\tmatches: %s\n",
        $_,
        @matches ? join(", ", @matches) : "none";
}

__DATA__
JIRA-001 is not valid but JIRA-1 is and so is BIN-10000,
A-1, and TACO-7133 but why look for BIN-10000000 or BINGO-1?

Remember that [0-9] will match 0001 and friends which you probably don't want. I think, but can't verify, Jira truncates issue prefixes to 4 characters max. So the regex I did only allows 1-4 capital letters; easy to change if wrong. 10 million tickets seems like a reasonably high top end for issue numbers. I also allowed for trailing punctuation. You may have to season that kind of thing to taste, wild data. You need the g and capture to an array instead of a scalar if you're matching strings that could have more than one issue id.

line: JIRA-001 is not valid but JIRA-1 is and so is BIN-10000,
        matches: JIRA-1, BIN-10000
line: A-1, and TACO-7133 but why look for BIN-10000000 or BINGO-1?
        matches: A-1, TACO-7133

来源：https://stackoverflow.com/questions/19322669/regular-expression-for-a-jira-identifier

标签

python

regex

perl

jira