regex javascript remove string that follows/precedes/delimits another string

Question

Hello regex experts!

Question One I want to find the sub string 'delimiter' and remove it as well as anything following it so the result is 'fredrobert'

var originalstring = 'fredrobertdelimitergarysusan';
var result = orig.match(/* not sure what goes here*/);              
console.log('result = ',result); //fredrobert

Question Two I want to find the sub string 'delimiter' and remove it as well as anything preceding it so the result is 'garysusan'

var originalstring = 'fredrobertdelimitergarysusan';
var result = orig.match(/* not sure what goes here*/);              
console.log('result = ',result); //garysusan

Question Three I want to find the sub strings 'delimiterA' and 'delimiterB' remove them as well as what is betweenso the result is 'fredsusan'

var originalstring = 'freddelimiterArobertgarydelimiterBsusan';
var result = orig.match(/* not sure what goes here*/);              
console.log('result = ',result);  //fredsusan

You could use the string-indexing function for a couple of these and search for the substring delimiter, then take a substring either up to or after that location (plus delimiter length). For the third one, consider /^(.*?)delimiter.*delimiter(.*?)$/ — abiessu
– abiessu, Commented Feb 13, 2014 at 16:40

elixenide · Accepted Answer · 2014-02-13 16:50:12Z

1

The key here is to use .replace(), not .match(). .match() finds text that matches a pattern, but doesn't replace it. .replace(), well, it replaces it!

Question One

Use .replace(), not .match():

var originalstring = 'fredrobertdelimitergarysusan';
var result = orig.replace(/delimiter.*/, '');              
console.log('result = ',result); //fredrobert

Question Two

Again, use .replace():

var originalstring = 'fredrobertdelimitergarysusan';
var result = orig.replace(/.*delimiter/, '');
console.log('result = ',result); //garysusan

Question Three

Use .replace() with .* between delimiters:

var originalstring = 'freddelimiterArobertgarydelimiterBsusan';
var result = orig.replace(/delimiterA.*delimiterB/, '');              
console.log('result = ',result);  //fredsusan

answered Feb 13, 2014 at 16:50

elixenide

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PrimeLens Over a year ago

excellent, this works. here is the jsfiddle of this http://jsfiddle.net/s7H9v/2/

La-comadreja · Accepted Answer · 2014-02-13 16:42:21Z

0

Match the word "delimiter" and everything after it, to the end of the string:

/delimiter.*$/

"delimiter" and everything preceding it:

/^.*delimiter/

"delimiterA," "delimiterB" and everything between:

/delimiterA.*delimiterB/

answered Feb 13, 2014 at 16:42

La-comadreja

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1 Comment

PrimeLens Over a year ago

this didn't work see this jsfiddle and watch console link

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