Regex to match between 2 strings and contains another string

Question

Here is my input string

2014.10.30: b l ah bl a h 2014.10.30: bfoo lah b l ah 2014.10.30: bart1 lah baloon l ah 2014.10.30: carb lah b l ah 2014.10.30: farb2 lah baloon l ah 2014.10.30: carb lah b l ah 2014.10.30: bom lah baloob l ah etc

I would like to match the following (between the 2014 which has the word baloon inside them):

2014.10.30: bart1 lah baloon l ah

and

2014.10.30: farb2 lah baloon l ah

This is what I have,

/(2014)(.*?baloon.*)(?:2014)/gsmi

and this is matching from the beginning of the first occurrence of 2014. And its returning only one match with bottom to top. regex101 here

Different programming languages have different flavors of regex. Most of them support "getNextMatch". For example: stackoverflow.com/a/520845/1057429 — Nir Alfasi
– Nir Alfasi, Commented Nov 1, 2014 at 2:57

Avinash Raj · Accepted Answer · 2014-11-01 03:03:44Z

Use negative and positive lookahead assertion.

2014(?:(?!2014).)*?baloon.*?(?=\n2014)

DEMO

OR

2014(?:(?!2014).)*?baloon(?:(?!2014).)*?(?=\n2014)

(?:(?!2014).)*? would match any character but not of 2014. This asserts that there isn't a string 2014 present in-between the starting 2014 and baloon

DEMO

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