php regexp: can't exclude one element

Question

I am trying to set-up a quite complex regexp, but I can't avoid just one element from not-match list.

My regular expression is:

1234567-8_abc((?!_ABC|_DEFGHI)[\w]?)*(\.ios|\.and)

What I have to exclude is:

1234567-8_abc.ios
1234567-8_abc_DEFGHI.ios
1234567-8_abc_ABC.ios

Instead, what I have to include is:

1234567-8_abc_1UP.ios
1234567-8_abc_FI.ios
1234567-8_abc_gmg.ios
1234567-8_abc_1UP.and
1234567-8_abc_FI.and
1234567-8_abc_gmg.and
1234567-8_abc_ddd.and
1234567-8_abc_qwert.ios
1234567-8_abc_88.ios

Well, I can't exclude the first option (1234567-8_abc.ios).

I tried it here.

How can I achieve this?

Thank you!

Casimir et Hippolyte · Accepted Answer · 2014-11-03 15:57:43Z

1

You can use this pattern:

1234567-8_abc_[^_.]++(?<!_ABC|_DEFGHI)\.(?:ios|and)

Note: I assume that each substring between _ and .ios doesn't contain a dot or an underscore.

The possessive quantifier ++ is necessary to fail faster with the less possible backtracking steps

edited Nov 3, 2014 at 15:57

answered Nov 3, 2014 at 15:43

Casimir et Hippolyte

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OIS · Accepted Answer · 2014-11-03 15:41:48Z

0

This regex matches your examples in PHP:

1234567-8_abc_((?!ABC|DEFGHI)[\w]?)*(\.ios|\.and)

answered Nov 3, 2014 at 15:41

OIS

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Avinash Raj · Accepted Answer · 2014-11-03 15:50:12Z

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Add a negative lookahead like below,

1234567-8_abc(?!_ABC|_DEFGHI)\w+(\.ios|\.and)

DEMO

(?!_ABC|_DEFGHI) Negative lookahead asserts that the string following _abc wouldn't be _ABC or _DEFGHI . And it must have one or more word characters before .ios or .and. So it won't match this 1234567-8_abc.ios string.

edited Nov 3, 2014 at 15:50

answered Nov 3, 2014 at 15:41

Avinash Raj

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vks · Accepted Answer · 2014-11-03 15:58:12Z

0

1234567-8_abc(?:(?!_ABC|_DEFGHI)\w)+(\.ios|\.and)

Try this.Your regex has left \w after 1234567-8_abc optional.Just made it compulsary.See demo.

http://regex101.com/r/bB8jY7/1

edited Nov 3, 2014 at 15:58

answered Nov 3, 2014 at 15:48

vks

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1 Comment

Amal Over a year ago

Just a minor note: [\w] can be just \w.

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