Is there a way to use regex to match only multi-line strings without matching single-line strings as well? Here is the current regex I am using:
Regex
('|"|`)[\s\S]*?(\1)
Test string
"not a match"
"need
to
match"
Is there a way to use regex to match only multi-line strings without matching single-line strings as well? Here is the current regex I am using:
Regex
('|"|`)[\s\S]*?(\1)
Test string
"not a match"
"need
to
match"
Your input string includes three possible substrings enclosed in double quotes:
"not a match""\n""need\nto\nmatch"Due to the risk of the regex engine picking up the ending " of one pair as the beginning " of the next pair, using lookarounds may not be reliable. The regex
(['"`])(?:(?!\1).)*\n[\s\S]*?\1To mitigate this problem, it is recommended to apply your regex and then filter out matches containing newline characters:
const text = '"not a match"\n"need\nto\nmatch"';
const rx = /(['"`]).*?\1/gs;
console.log( text.match(rx).filter(x => x.includes('\n')) )A multiline string is a string that has a minimum of one newline character. An example pattern to match this type of string would be:
('|"|`)[\s\S]*?\n[\s\S]*(\1)
However, using this pattern will match the entire example provided, as [\s\S]* includes the string delimiters.
To better handle this situation, you can try using the following pattern:
'[^']*?\n[^']*?'|"[^']*?\n[^']*?"|`[^']*?\n[^']*?`
This revised pattern takes into account escaped quotation marks, which the previous pattern did not address.
Perhaps this seems overly complicated?
('|"|`)(?:(?:(?!\1).)+?\n)+(?:(?!\1).)+\1
Let's break it down:
┌─ matches at least one of the specified characters
│ ┌─ followed by one or more non-quote characters
│ │ and ending with a quote character
('|"|`)(?:(?:(?!\1).)+?\n)+(?:(?!\1).)+\1
└──┬──┘ │ │ ││ │
└────────────────────────────── matches the opening specified character
│ │ ││ │ and groups it in group 1
│ │ ││ │
│ └──┬─┘└─────│────── matches any character that is not a specified character
│ └───────│──────── ensures the fewest possible matches
└────┬───────┘
└──────── follows with a line break
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