Remove lines with a specific char with javascript and regex

Question

I have some text files containing something as:

CID Principal CID 2 CID 3 CID 4
-
-
-
-
Observações Gerais:
Paciente relata dor cronica ,agudizada e limitante do joelho direito , edema +/3+, nega trauma ou queda, dor a palpação na interlinha articular medial.
Hipótese Diagnóstica:
Conduta:
Lisador dip, restiva 5 mg adesivos, gelo, fisioterapia, Rx da bacia, joelhos com carga e orientações.

I´d like a regex to get rid of:

all empty lines
lines containing only "-" and no more chars.

I have tried:

mytext.replace(/^\s*[\r\n\-]/gm, "");

But no luck. How could I do that using javascript?

The regex is matching the - lines? regex101.com/r/HcCxd5/1 — evolutionxbox
– evolutionxbox, Commented Feb 3, 2021 at 19:24

Wiktor Stribiżew · Accepted Answer · 2021-02-03 19:57:25Z

4

If the lines with hyphens always consist of a single hyphen, you might as well go with a non-regex solution like

text.split("\n").filter(x => x.trim().length > 0 && x != '-').join("\n")

As for a regex solution, you can use

/^(?:\s*|-+)$[\r\n]*/gm

See the regex demo. Note it will remove lines that consist of one or more hyphens, if this is not expected replace -+ with -.

Details:

^ - start of a line
(?:\s*|-+) - either zero or more whitespaces or one or more hyphens
$ - end of line
[\r\n]* - zero or more CR or LF chars.

See a JavaScript demo:

const text = "CID Principal CID 2 CID 3 CID 4\n-\n-\n-\n-\nObservações Gerais:\nPaciente relata dor cronica ,agudizada e limitante do joelho direito , edema +/3+, nega trauma ou queda, dor a palpação na interlinha articular medial.\nHipótese Diagnóstica:\nConduta:\nLisador dip, restiva 5 mg adesivos, gelo, fisioterapia, Rx da bacia, joelhos com carga e orientações.";
const regex = /^(?:\s*|-+)$[\r\n]*/gm;
console.log(text.replace(regex, ''));
// Non-regex solution:
console.log(text.split("\n").filter(x => x.trim().length > 0 && x != '-').join("\n"));

edited Feb 3, 2021 at 19:57

answered Feb 3, 2021 at 19:24

Wiktor Stribiżew

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2 Comments

Luiz Alves Over a year ago

Thank you. It works well. Now I am getting with other text strings something as: 'Anamnese\n' + '========\n' + '\n' + 'CID Principal CID 2 CID 3 CID 4 \n' + 'Observações Gerais: \n' + 'retornando querendo acupuntura dado pedido parou a terapia cd: acupuntura + orientada a retornar para terapia \n' + 'Hipótese Diagnóstica: \n' + 'Conduta: \n' . Is possible get rid off that '\n'?

Wiktor Stribiżew Over a year ago

@LuizAlves Ok, I see, the \s+ must be replaced with \s*.

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