Regular Expression substring start and end with JavaScript

Question

I have a string:

"/upload/c_fill,w_960,h_640/v1430399111/"

Where i want to replace wherever "w_" to some other value, say w_960 to w_930 while 960 could be vary.

i tried following but not able to find string end with:

var imgPath = elemPath.replace(/(\,w_)/, ",w_"+930);

Your question is unclear. Please show several examples of "before" and "after" strings, i.e. the input and desired output. — Jim Garrison
– Jim Garrison, Commented Jul 2, 2015 at 5:52
what you actually want to replace can you please say that with more example. .? — Himesh Aadeshara
– Himesh Aadeshara, Commented Jul 2, 2015 at 6:03

ndnenkov · Accepted Answer · 2015-07-02 06:12:09Z

2

If I understand you correctly you wanted to replace ,w_ followed by three digits with ,w_930. You were on the right track. You can use \d to match a digit and {3} for three repetitions. Also you don't need the group () or to escape the comma:

var imgPath = elemPath.replace(/,w_\d{3}/, ",w_"+930);

If the number of digits can vary, use + (one or more repetitions):

var imgPath = elemPath.replace(/,w_\d+/, ",w_"+930);

edited Jul 2, 2015 at 6:12

answered Jul 2, 2015 at 5:56

ndnenkov

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