is there a regex expression to replace this if condition

Question

I have three string and i need to check if one of them contains the other 2 in the same order given, right now i am using alot of conditions to achive this, is there a way to simplify it using regex?

here is the code:

var a = '**';
var b = '##';
var phrase = '**Lorem ipsum dolor sit amet##';

if(phrase.includes(a) && phrase.includes(b) && (phrase.indexOf(a) < phrase.indexOf(b))) {
  // add logic
}

Does this answer your question? [Regex Match all characters between two strings](https://stackoverflow.com/questions/6109882/regex-match-all-characters-between-two-strings) — Robert Harvey, Nov 21 '21 at 15:09

The fourth bird · Accepted Answer · 2021-11-21T15:13:09.760

2

You could use a pattern to match ** before ##

^(?:(?!##|\*\*).)*\*\*.*##

^ Start of string
(?:(?!##|\*\*).)* Match any char while not directly followed by either ## or **
\*\* First match **
.* Match any character 0+ times
## Match ##

Regex demo

var phrase = '**Lorem ipsum dolor sit amet##';

if (phrase.match(/^(?:(?!##|\*\*).)*\*\*.*##/)) {
  // add logic
}

var phrases = [
  '**Lorem ipsum dolor sit amet##',
  'test****#**##',
  '##**Lorem ipsum dolor sit amet##',
  '##**##**',
];
phrases.forEach(phrase => {
  if (phrase.match(/^(?:(?!##|\*\*).)*\*\*.*##/)) {
    console.log(`Match for ${phrase}`);
  } else {
    console.log(`No match for ${phrase}`);
  }
});

edited Nov 21 '21 at 15:13

answered Nov 21 '21 at 15:01

The fourth bird

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What about something simpler `/\*\*.+?##/`? – evolutionxbox Nov 21 '21 at 15:01
2

@evolutionxbox Because that something simpler gives a false positive here https://regex101.com/r/IO4n0u/1 – The fourth bird Nov 21 '21 at 15:02
1

@Thefourthbird thanks thats what i was looking for – DAbuzied Nov 21 '21 at 18:45

is there a regex expression to replace this if condition

1 Answers1