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Regex pattern to match a word based on previous and next word?

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

I am trying to highlight a word based on the previous and next word matching with specific customer requirements.

A word should be highlighted only when previous and next word doesn't start with CAPS.

I have created regex "(?!bA-Zb)sSouls+(?!s[A-Z,0-9])" but it's also highlighting "Souls" with previous word that starts with capital.

https://regex101.com/r/wPmijX/2

In this case, "Souls" next to "Dark" should not be highlighted as it starts with caps. Only "Souls" in the second paragraph should be highlighted. Event "Souls" in the third paragraph should not be highlighted as "Game" start with capital letter.

javascript regex regex-lookarounds

share|improve this question

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You may use groups and then post-process the results, see ((?:^|b[a-z]w*)s+)(Souls)(?!s+[A-Z0-9])
  
  – Wiktor Stribiżew
  Mar 26 at 11:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, That worked for me.
  
  – nishant
  Mar 26 at 13:47
  

  
  
  
  

add a comment | 

0

I am trying to highlight a word based on the previous and next word matching with specific customer requirements.

A word should be highlighted only when previous and next word doesn't start with CAPS.

I have created regex "(?!bA-Zb)sSouls+(?!s[A-Z,0-9])" but it's also highlighting "Souls" with previous word that starts with capital.

https://regex101.com/r/wPmijX/2

In this case, "Souls" next to "Dark" should not be highlighted as it starts with caps. Only "Souls" in the second paragraph should be highlighted. Event "Souls" in the third paragraph should not be highlighted as "Game" start with capital letter.

javascript regex regex-lookarounds

share|improve this question

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You may use groups and then post-process the results, see ((?:^|b[a-z]w*)s+)(Souls)(?!s+[A-Z0-9])
  
  – Wiktor Stribiżew
  Mar 26 at 11:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, That worked for me.
  
  – nishant
  Mar 26 at 13:47
  

  
  
  
  

add a comment | 

I am trying to highlight a word based on the previous and next word matching with specific customer requirements.

A word should be highlighted only when previous and next word doesn't start with CAPS.

I have created regex "(?!bA-Zb)sSouls+(?!s[A-Z,0-9])" but it's also highlighting "Souls" with previous word that starts with capital.

https://regex101.com/r/wPmijX/2

In this case, "Souls" next to "Dark" should not be highlighted as it starts with caps. Only "Souls" in the second paragraph should be highlighted. Event "Souls" in the third paragraph should not be highlighted as "Game" start with capital letter.

javascript regex regex-lookarounds

share|improve this question

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

share|improve this question

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

share|improve this question

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

asked Mar 26 at 11:31

nishantnishant

633 bronze badges

2 Answers
2

active

oldest

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0

Try Regex: (?<=b[a-z]w+b b)Souls(?=b [a-z]w+b)

Demo

share|improve this answer

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Take care that lookbehind in javascript is only supported by Chrome.
  
  – Toto
  Mar 26 at 12:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, That worked for me in chrome browser but any other option for others browser.
  
  – nishant
  Mar 26 at 13:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @nishant Why not use capturing groups if it should work in other browsers?
  
  – The fourth bird
  Mar 26 at 14:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  as Toto mentioned, lookbehind might not be supported in non-chrome browsers yet. (I've overlooked that possibility). you might want to consider @Thefourthbird's answer.
  
  – Matt.G
  Mar 26 at 14:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In chrome, it's worked but in Firefox getting the error "SyntaxError: invalid regexp group".
  
  – nishant
  Mar 26 at 14:17
  

  
  
  
  

 | 
show 2 more comments

0

If the match should be between 2 words, you could use 2 capturing groups. First capture the word before that does not start with an uppercase char and the following spaces.

Then capture Souls in a group and use a positive lookahead to assert what follows is 1+ times a space and does not start with an uppercase char.

Then you can use the captured groups in the replacement.

b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])

That will match

• 
  b Word boundary


• 
  ( Start capturing group
  
  
  • 
    [^WA-Z]w* + Match a word char but not a capital, 0+ times a word char and 1+ times a space
  
  


• 
  ) Close capturing group


• 
  (Souls) Capture Souls in a group


• 
  (?= Positive lookahead to assert what follows
  
  
  • 
    +[^WA-Z] Match 1+ times a space followed by a word char but not a capital
  
  


• 
  ) Close lookahead

Regex demo

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

share|improve this answer

edited Mar 26 at 16:01

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges

add a comment | 

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0

Try Regex: (?<=b[a-z]w+b b)Souls(?=b [a-z]w+b)

Demo

share|improve this answer

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Take care that lookbehind in javascript is only supported by Chrome.
  
  – Toto
  Mar 26 at 12:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, That worked for me in chrome browser but any other option for others browser.
  
  – nishant
  Mar 26 at 13:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @nishant Why not use capturing groups if it should work in other browsers?
  
  – The fourth bird
  Mar 26 at 14:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  as Toto mentioned, lookbehind might not be supported in non-chrome browsers yet. (I've overlooked that possibility). you might want to consider @Thefourthbird's answer.
  
  – Matt.G
  Mar 26 at 14:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In chrome, it's worked but in Firefox getting the error "SyntaxError: invalid regexp group".
  
  – nishant
  Mar 26 at 14:17
  

  
  
  
  

 | 
show 2 more comments

0

Try Regex: (?<=b[a-z]w+b b)Souls(?=b [a-z]w+b)

Demo

share|improve this answer

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Take care that lookbehind in javascript is only supported by Chrome.
  
  – Toto
  Mar 26 at 12:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, That worked for me in chrome browser but any other option for others browser.
  
  – nishant
  Mar 26 at 13:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @nishant Why not use capturing groups if it should work in other browsers?
  
  – The fourth bird
  Mar 26 at 14:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  as Toto mentioned, lookbehind might not be supported in non-chrome browsers yet. (I've overlooked that possibility). you might want to consider @Thefourthbird's answer.
  
  – Matt.G
  Mar 26 at 14:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In chrome, it's worked but in Firefox getting the error "SyntaxError: invalid regexp group".
  
  – nishant
  Mar 26 at 14:17
  

  
  
  
  

 | 
show 2 more comments

Try Regex: (?<=b[a-z]w+b b)Souls(?=b [a-z]w+b)

Demo

share|improve this answer

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

share|improve this answer

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

answered Mar 26 at 12:46

Matt.GMatt.G

2,97122 gold badges44 silver badges1616 bronze badges

0

If the match should be between 2 words, you could use 2 capturing groups. First capture the word before that does not start with an uppercase char and the following spaces.

Then capture Souls in a group and use a positive lookahead to assert what follows is 1+ times a space and does not start with an uppercase char.

Then you can use the captured groups in the replacement.

b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])

That will match

• 
  b Word boundary


• 
  ( Start capturing group
  
  
  • 
    [^WA-Z]w* + Match a word char but not a capital, 0+ times a word char and 1+ times a space
  
  


• 
  ) Close capturing group


• 
  (Souls) Capture Souls in a group


• 
  (?= Positive lookahead to assert what follows
  
  
  • 
    +[^WA-Z] Match 1+ times a space followed by a word char but not a capital
  
  


• 
  ) Close lookahead

Regex demo

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

share|improve this answer

edited Mar 26 at 16:01

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges

add a comment | 

0

If the match should be between 2 words, you could use 2 capturing groups. First capture the word before that does not start with an uppercase char and the following spaces.

Then capture Souls in a group and use a positive lookahead to assert what follows is 1+ times a space and does not start with an uppercase char.

Then you can use the captured groups in the replacement.

b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])

That will match

• 
  b Word boundary


• 
  ( Start capturing group
  
  
  • 
    [^WA-Z]w* + Match a word char but not a capital, 0+ times a word char and 1+ times a space
  
  


• 
  ) Close capturing group


• 
  (Souls) Capture Souls in a group


• 
  (?= Positive lookahead to assert what follows
  
  
  • 
    +[^WA-Z] Match 1+ times a space followed by a word char but not a capital
  
  


• 
  ) Close lookahead

Regex demo

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

share|improve this answer

edited Mar 26 at 16:01

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges

add a comment | 

If the match should be between 2 words, you could use 2 capturing groups. First capture the word before that does not start with an uppercase char and the following spaces.

Then capture Souls in a group and use a positive lookahead to assert what follows is 1+ times a space and does not start with an uppercase char.

Then you can use the captured groups in the replacement.

b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])

That will match

• 
  b Word boundary


• 
  ( Start capturing group
  
  
  • 
    [^WA-Z]w* + Match a word char but not a capital, 0+ times a word char and 1+ times a space
  
  


• 
  ) Close capturing group


• 
  (Souls) Capture Souls in a group


• 
  (?= Positive lookahead to assert what follows
  
  
  • 
    +[^WA-Z] Match 1+ times a space followed by a word char but not a capital
  
  


• 
  ) Close lookahead

Regex demo

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

share|improve this answer

edited Mar 26 at 16:01

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges

b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

const regex = /b([^WA-Z]w* +)(Souls)(?= +[^WA-Z])/gm;
const str = `When I finally finished Dark Souls for the first time, that feeling of struggle and triumph, of having wandered a vast and lonesome landscape, stuck with me for weeks. 

The creator of the Souls series and game director on Sekiro: Shadows Die Twice.

The Souls Game start with competent price.`;
const subst = `$1<strong>$2</strong>`;
const result = str.replace(regex, subst);

document.write(result);

share|improve this answer

edited Mar 26 at 16:01

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges

answered Mar 26 at 12:08

The fourth birdThe fourth bird

36.1k99 gold badges1717 silver badges3434 bronze badges