How to replace a string in javascript only when it's comes before another string using regex? [duplicate]

Question

I want to replace xx with . in this string 100x100/<name>xx-somename-xxjpg but only xx comes next to jpg.

'100x100/<name>xx-somename-xxjpg'.replace(/(xx(jpg|jpeg|png))/,'$')
What I get -> 100x100/<name>xx-somename-$
What I expect-> 100x100/<name>xx-somename-.jpg

How do I do it?

See the linked question (there are lots, that may or may not be the best one), basically it's xx(?=jpg|jpeg|png). The (?=___) is the lookahead. — T.J. Crowder
– T.J. Crowder, Commented Jan 14, 2020 at 9:39

MadDeveloper · Accepted Answer · 2020-01-14 09:41:06Z

-2

'100x100/<name>xx-somename-xxjpg'.replace(/(xx)(?=jpg|jpeg|png)/,'.')

answered Jan 14, 2020 at 9:41

MadDeveloper

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