Regex extract string between 2 strings, that contains 3rd string

Question

I have this regex

(?<=TG00).*?(?=#)

which extracts all strings between TG00 and #. Demo: https://regex101.com/r/04oqua/1

Now, from above results I want to extract only the string which contains TG40 155963. How can I do it?

have any preferences to programming languages?

RomanPerekhrest
– RomanPerekhrest

2018-01-18 11:50:38 +00:00
Commented Jan 18, 2018 at 11:50 — RomanPerekhrest
– RomanPerekhrest, Commented Jan 18, 2018 at 11:50

Tim Biegeleisen · Accepted Answer · 2018-01-18 11:51:40Z

2

Try this pattern:

TG00[^#]*TG40 155963[^#]*#

This pattern just says to find the string TG40 155963 in between TG00 and an ending #. For the sample data in your demo there were 3 matches.

Demo

answered Jan 18, 2018 at 11:51

Tim Biegeleisen

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1 Comment

Makis Over a year ago

Many thanks to all for the answers, all are working great! In my special needs this seems to work smoother. Ty!

Justinas Marozas · Accepted Answer · 2018-01-18 11:57:32Z

1

For some reason appending .*? to your lookbehind results in engine error, but works fine with lookahead. Regex below does not match your text exactly, but it does extract it via capture group.

(?<=TG00).*?(TG40 155963)(?=.*?#)

answered Jan 18, 2018 at 11:57

Justinas Marozas

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Comments

anubhava · Accepted Answer · 2018-01-18 14:27:38Z

1

You can use this regex with a lookahead and negated character class:

(?<=TG00)(?=[^#]*TG40 155963)[^#]+(?=#)

RegEx Demo

RegEx Explanation:

(?<=TG00): Assert that we have TG00 at previous position
(?=[^#]*TG40 155963): Lookahead to assert we have string TG40 155963 after 0 or more non-# characters, ahead
[^#]+: Match 1+ non-# characters

edited Jan 18, 2018 at 14:27

answered Jan 18, 2018 at 11:49

anubhava

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2 Comments

tripleee Over a year ago

You seem to have dropped the (?=#) requirement from the end. I guess it should not match if there isn't actually a # after the match.

anubhava Over a year ago

Thanks @tripleee, added it now

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