I need a Regex to search for "item one" and get "Amet Elit" . Or "Title" and get "One sentence with\\na linebreak!"
- item one: Amet Elit
- Title: One sentence with
a line break!
- Desc: Hello and thank you for your help!
So the Regex has to find everything after -
, some specific words and a :
. And this string ends before a line break with a following -
.
I tried this
/[^-\s'item one']:*(.*)/g
under https://regex101.com/ .
You can try with this pattern:
/^- ([^:]*): (.*(?>\R.*)*?(?=\R- |\R*\z))/m
The key and the value are captured in group 1 and group 2. The group 2 contains a non-greedy quantifier to match until the condition in the lookahead succeeds. The lookahead (?=...)
checks if the second group is followed by a newline ( \\R
) or the end of the string ( \\z
)
To obtain a specific item, replace ([^:]*)
with whatever you want.
You can use this search function:
function srch($input, $key) {
preg_match('/(?<=\b' . preg_quote($key, '/') . ': ).*?(?=\n-|$)/s', $input, $m);
return $m[0];
}
Then call it as:
$input = "- item one: Amet Elit
- Title: One sentence with
a line break!
- Desc: Hello and thank you for your help!";
php> echo srch($input, 'Title')
One sentence with
a line break!
php> echo srch($input, 'item one')
Amet Elit
php> echo srch($input, 'Desc')
Hello and thank you for your help!
The following should work:
^-\h*([^:\R]*)\h*:\h*(.*$(?:\R[^-].*$)*)
Fiddle .
Broken up in parts:
^-\\h*([^:\\R]*)\\h*
: matches the words between the starting hyphen (must occur at line start) up to a colon, trimmed ( \\h*
are horizontal blanks outside the capture). There cannot be line-breaks in that part ( \\R
)
\\h*(.*)
: matches the rest of the line (left-trimmed).
(?:\\R[^-].*$)*
: non-capturing ( (?:
) group allowing zero or more lines following, on the condition they do not start with a hyphen ( \\R[^-]
).
In PHP:
$input = "- item one: Amet Elit
- Title: One sentence with
a line break!
- Desc: Hello and thank you for your help!";
preg_match_all("#^-\s*([^:\R]*)\s*:\s*(.*(?:\R[^-].*$)*)#m",
$input, $matches);
foreach ($matches[1] as $i => $prefix) {
echo $prefix . " | " . $matches[2][$i] . "<br>";
}
Output:
item one | Amet Elit
Title | One sentence with
a line break!
Desc | Hello and thank you for your help!
Use positive lookbehind:
(?<=^- item one: ).*$
If the phrase ( item one
in the above example) is not constant, you could use \\K
to drop everything matched so far to achieve a positive lookbehind with variable length:
^- [^:]*: \K.*$
Here is a slight alternation to allow you to match over multiple lines. Don't forget the gm
flags
^- [^:]*: \K(.|\n)*?(?=^-|$)
You're not far off.
Instead of matching exactly with item one
you want to match with a word or space, so that would be [\\w\\s]*
Something along the lines of ^- [\\w\\s]*: (.*)
should work, though you haven't mentioned how this information is coming in. One line, are you trying to search and replace? using preg_match
?
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