Replace a substring contained between two substring in javascript

Question

I have this string

'bookmarkState={"params":{"date_from":"2014-07-31","date_to":"2014-10-01"}}'

I want to replace 2014-07-31 with 2014-01-01, i.e. the substring contained between '"date_from":"' and '","', using a regular expression in javascript. I have written this code but it doesn't work:

var qs = 'bookmarkState={"params":{"date_from":"2014-07-31","date_to":"2014-10-01"}};'
var regEx = /^(.*?date_from":")[^"]*(".*)$/;
qs = qs.replace(regEx, '2014-01-01');`

Casimir et Hippolyte · Accepted Answer · 2014-10-09 13:55:00Z

2

You don't need a regex to do that:

eval('bookmarkState={"params":{"date_from":"2014-07-31","date_to":"2014-10-01"}}');

bookmarkState.params.date_from = '1988-04-12';

console.log(JSON.stringify(bookmarkState));

edited Oct 9, 2014 at 13:55

answered Oct 9, 2014 at 13:45

Casimir et Hippolyte

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vks · Accepted Answer · 2014-10-09 13:44:51Z

0

^(.*?date_from":")[^"]*(",".*)$

Try this.Replace by $1<your string>$2.See demo.

http://regex101.com/r/qZ0uP0/1

answered Oct 9, 2014 at 13:44

vks

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5 Comments

user2100029 Over a year ago

I write this code but it doesn't work var qs = bookmarkState={"params":{"date_from":"2014-07-31","date_to":"2014-10-01"}}'; var regExp = /^(.*?date_from":")[^"]*(".*)$/; qs = qs.replace(regExp, '2014-01-01');

vks Over a year ago

@RobertoGentili you need to use replace()

vks Over a year ago

@RobertoGentili you need to use flag re.Multiline

user2100029 Over a year ago

var qs = 'bookmarkState={"params":{"date_from":"2014-07-31","date_to":"2014-10-01"}}'; var regEx = new RegExp('^(.*?date_from":")[^"]*(".*)$', 'm'); qs = qs.replace(regExp, '2014-01-01'); Doesn't works (flag m setted)

vks Over a year ago

@RobertoGentili replace text will be $1<something>$2 and what is the error

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