Regex for selecting words ending in 'ing' unless

I want to select words ending in with a regular expression, but I want exclude words that end in thing. For example:

everything
running 
catching 
nothing

Of these words, running and catching should be selected, everything and nothing should be excluded.

I've tried the following:

.+ing$

But that selects everything. I'm thinking look aheads/look arounds could be the solution, but I haven't been able to get one that works.

Solutions that work in Python or R would be helpful.

asked Nov 12 '18 at 21:08

Todd Shannon

537

Use bw*ingb(?<!thing) or bw*(?<!th)ingb
– Wiktor Stribiżew
Nov 12 '18 at 21:11

add a comment |

I want to select words ending in with a regular expression, but I want exclude words that end in thing. For example:

everything
running 
catching 
nothing

Of these words, running and catching should be selected, everything and nothing should be excluded.

I've tried the following:

.+ing$

But that selects everything. I'm thinking look aheads/look arounds could be the solution, but I haven't been able to get one that works.

Solutions that work in Python or R would be helpful.

asked Nov 12 '18 at 21:08

Todd Shannon

537

Use bw*ingb(?<!thing) or bw*(?<!th)ingb
– Wiktor Stribiżew
Nov 12 '18 at 21:11

add a comment |

I want to select words ending in with a regular expression, but I want exclude words that end in thing. For example:

everything
running 
catching 
nothing

Of these words, running and catching should be selected, everything and nothing should be excluded.

I've tried the following:

.+ing$

But that selects everything. I'm thinking look aheads/look arounds could be the solution, but I haven't been able to get one that works.

Solutions that work in Python or R would be helpful.

asked Nov 12 '18 at 21:08

Todd Shannon

537

I want to select words ending in with a regular expression, but I want exclude words that end in thing. For example:

everything
running 
catching 
nothing

Of these words, running and catching should be selected, everything and nothing should be excluded.

I've tried the following:

.+ing$

But that selects everything. I'm thinking look aheads/look arounds could be the solution, but I haven't been able to get one that works.

Solutions that work in Python or R would be helpful.

regex regex-negation regex-lookarounds

asked Nov 12 '18 at 21:08

Todd Shannon

537

asked Nov 12 '18 at 21:08

Todd Shannon

537

asked Nov 12 '18 at 21:08

Todd Shannon

537

asked Nov 12 '18 at 21:08

Todd Shannon

537

asked Nov 12 '18 at 21:08

Todd Shannon

537

Use bw*ingb(?<!thing) or bw*(?<!th)ingb
– Wiktor Stribiżew
Nov 12 '18 at 21:11

add a comment |

Use bw*ingb(?<!thing) or bw*(?<!th)ingb
– Wiktor Stribiżew
Nov 12 '18 at 21:11

Use bw*ingb(?<!thing) or bw*(?<!th)ingb
– Wiktor Stribiżew
Nov 12 '18 at 21:11

add a comment |

3 Answers
3

active

oldest

votes

In python you can use negative lookbehind assertion as this:

^.*(?<!th)ing$

RegEx Demo

(?<!th) is negative lookbehind expression that will fail the match if th comes before ing at the end of string.

Note that if you are matching words that are not on separate lines then instead of anchors use word boundaries as:

w+(?<!th)ingb

answered Nov 12 '18 at 21:11

anubhava

520k46316390

add a comment |

Something like bw+(?<!th)ingb maybe.

answered Nov 12 '18 at 21:11

sln

26.3k31636

add a comment |

You might also use a negative lookahead (?! to assert that what is on the right is not 0+ times a word character followed by thing and a word boundary:

b(?!w*thingb)w*ingb

Regex demo | Python demo

edited Nov 12 '18 at 21:48

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

Think you need to add ing to the end of your regex so that it does not match words that do not end in "ing".
– benvc
Nov 12 '18 at 21:17

@benvc You are correct, thank you!
– The fourth bird
Nov 12 '18 at 21:21

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

In python you can use negative lookbehind assertion as this:

^.*(?<!th)ing$

RegEx Demo

(?<!th) is negative lookbehind expression that will fail the match if th comes before ing at the end of string.

Note that if you are matching words that are not on separate lines then instead of anchors use word boundaries as:

w+(?<!th)ingb

answered Nov 12 '18 at 21:11

anubhava

520k46316390

add a comment |

In python you can use negative lookbehind assertion as this:

^.*(?<!th)ing$

RegEx Demo

(?<!th) is negative lookbehind expression that will fail the match if th comes before ing at the end of string.

Note that if you are matching words that are not on separate lines then instead of anchors use word boundaries as:

w+(?<!th)ingb

answered Nov 12 '18 at 21:11

anubhava

520k46316390

add a comment |

In python you can use negative lookbehind assertion as this:

^.*(?<!th)ing$

RegEx Demo

(?<!th) is negative lookbehind expression that will fail the match if th comes before ing at the end of string.

Note that if you are matching words that are not on separate lines then instead of anchors use word boundaries as:

w+(?<!th)ingb

answered Nov 12 '18 at 21:11

anubhava

520k46316390

In python you can use negative lookbehind assertion as this:

^.*(?<!th)ing$

RegEx Demo

(?<!th) is negative lookbehind expression that will fail the match if th comes before ing at the end of string.

Note that if you are matching words that are not on separate lines then instead of anchors use word boundaries as:

w+(?<!th)ingb

answered Nov 12 '18 at 21:11

anubhava

520k46316390

answered Nov 12 '18 at 21:11

anubhava

520k46316390

answered Nov 12 '18 at 21:11

anubhava

520k46316390

answered Nov 12 '18 at 21:11

anubhava

520k46316390

add a comment |

Something like bw+(?<!th)ingb maybe.

answered Nov 12 '18 at 21:11

sln

26.3k31636

add a comment |

Something like bw+(?<!th)ingb maybe.

answered Nov 12 '18 at 21:11

sln

26.3k31636

add a comment |

Something like bw+(?<!th)ingb maybe.

answered Nov 12 '18 at 21:11

sln

26.3k31636

Something like bw+(?<!th)ingb maybe.

answered Nov 12 '18 at 21:11

sln

26.3k31636

answered Nov 12 '18 at 21:11

sln

26.3k31636

answered Nov 12 '18 at 21:11

sln

26.3k31636

answered Nov 12 '18 at 21:11

sln

26.3k31636

add a comment |

You might also use a negative lookahead (?! to assert that what is on the right is not 0+ times a word character followed by thing and a word boundary:

b(?!w*thingb)w*ingb

Regex demo | Python demo

edited Nov 12 '18 at 21:48

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

Think you need to add ing to the end of your regex so that it does not match words that do not end in "ing".
– benvc
Nov 12 '18 at 21:17

@benvc You are correct, thank you!
– The fourth bird
Nov 12 '18 at 21:21

add a comment |

You might also use a negative lookahead (?! to assert that what is on the right is not 0+ times a word character followed by thing and a word boundary:

b(?!w*thingb)w*ingb

Regex demo | Python demo

edited Nov 12 '18 at 21:48

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

Think you need to add ing to the end of your regex so that it does not match words that do not end in "ing".
– benvc
Nov 12 '18 at 21:17

@benvc You are correct, thank you!
– The fourth bird
Nov 12 '18 at 21:21

add a comment |

You might also use a negative lookahead (?! to assert that what is on the right is not 0+ times a word character followed by thing and a word boundary:

b(?!w*thingb)w*ingb

Regex demo | Python demo

edited Nov 12 '18 at 21:48

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

You might also use a negative lookahead (?! to assert that what is on the right is not 0+ times a word character followed by thing and a word boundary:

b(?!w*thingb)w*ingb

Regex demo | Python demo

edited Nov 12 '18 at 21:48

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

edited Nov 12 '18 at 21:48

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

answered Nov 12 '18 at 21:15

The fourth bird

20.8k71326

Think you need to add ing to the end of your regex so that it does not match words that do not end in "ing".
– benvc
Nov 12 '18 at 21:17

@benvc You are correct, thank you!
– The fourth bird
Nov 12 '18 at 21:21

add a comment |

Think you need to add ing to the end of your regex so that it does not match words that do not end in "ing".
– benvc
Nov 12 '18 at 21:17

@benvc You are correct, thank you!
– The fourth bird
Nov 12 '18 at 21:21

Think you need to add ing to the end of your regex so that it does not match words that do not end in "ing".
– benvc
Nov 12 '18 at 21:17

@benvc You are correct, thank you!
– The fourth bird
Nov 12 '18 at 21:21

add a comment |

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