How do you delete every line inside of a string that doesn't contain a specific word?-CodePudding

There's a string with multiple lines of random characters, I'd like to delete every line that doesn't contain the word

:tesTWORD:

For example, this part of the original string

"111"1"13648""
PA4123:tesTWORD:a6b4ba21ba54f6bde411930bd864b700"""""
"101"1"00000368""
PA1239:tesTWORD:a6b4ba21ba54f6bde411930b0001cb9d"""
PA0545:tesTWOR:b598944d1ba4c787e411800b8043559c""
""
PA1238:tesTWORD:a6b4ba21ba54f6bde411920b6ba5f90b
PA0545:tesWOR:b598944d1ba4c787e411800b8043559c""
3646475

Would turn into this:

PA4123:tesTWORD:a6b4ba21ba54f6bde411930bd864b700"""""
PA1239:tesTWORD:a6b4ba21ba54f6bde411930b0001cb9d"""
PA1238:tesTWORD:a6b4ba21ba54f6bde411920b6ba5f90b

So basically all lines that don't contain the exact word :tesTWORD: get deleted.

I have tried a bunch of different things like playing around with arrays, but nothing worked like it's supposed to

CodePudding user response：

You can use \n to split it into an array,then filter the array,finally using join() to form a new string

str.split('\n').filter(d => d.indexOf(':tesTWORD:') > -1).join('\n')

let str = `"111"1"13648""
PA4123:tesTWORD:a6b4ba21ba54f6bde411930bd864b700"""""
"101"1"00000368""
PA1239:tesTWORD:a6b4ba21ba54f6bde411930b0001cb9d"""
PA0545:tesTWOR:b598944d1ba4c787e411800b8043559c""
""
PA1238:tesTWORD:a6b4ba21ba54f6bde411920b6ba5f90b
PA0545:tesWOR:b598944d1ba4c787e411800b8043559c""
3646475`

let result = str.split('\n').filter(d => d.indexOf(':tesTWORD:') > -1).join('\n')

console.log(result)