How to fetch names using RegEx for given pattern?












1














I'm trying to fetch below patterns from the text using RegEx:



John Doe

JOHN DOE

Sam John Watson

Sam John Lilly Watson

SAM JOHN WATSON

SAM JOHN LILLY WATSON


Input Data only contains single line and I need to find above patterns in that.



More about Pattern




  • Each word will start with a Uppercase letter and followed by either Upper or Lowercase

  • Minimum 2 words

  • Maximum 4 words

  • Words will include only A-Z or a-z chars


What I Tried:



import re

re.findall("[A-Z][A-Za-z]+ [A-Z][A-Za-z]+ [A-Za-z]* [A-Za-z]*", text)


Which will correctly identifies input like:



Sam Peters John Doe

SAM WINCH DAN BROWN


but fails on input with less than 4 words.






python regex







share|improve this question


















  • 2




    If this is for a real system rather than a programming exercise, it is probably worth reading Falsehoods Programmers Believe About Names
    – mistertribs
    17 hours ago
















1














I'm trying to fetch below patterns from the text using RegEx:



John Doe

JOHN DOE

Sam John Watson

Sam John Lilly Watson

SAM JOHN WATSON

SAM JOHN LILLY WATSON


Input Data only contains single line and I need to find above patterns in that.



More about Pattern




  • Each word will start with a Uppercase letter and followed by either Upper or Lowercase

  • Minimum 2 words

  • Maximum 4 words

  • Words will include only A-Z or a-z chars


What I Tried:



import re

re.findall("[A-Z][A-Za-z]+ [A-Z][A-Za-z]+ [A-Za-z]* [A-Za-z]*", text)


Which will correctly identifies input like:



Sam Peters John Doe

SAM WINCH DAN BROWN


but fails on input with less than 4 words.






python regex







share|improve this question


















  • 2




    If this is for a real system rather than a programming exercise, it is probably worth reading Falsehoods Programmers Believe About Names
    – mistertribs
    17 hours ago














1












1








1







I'm trying to fetch below patterns from the text using RegEx:



John Doe

JOHN DOE

Sam John Watson

Sam John Lilly Watson

SAM JOHN WATSON

SAM JOHN LILLY WATSON


Input Data only contains single line and I need to find above patterns in that.



More about Pattern




  • Each word will start with a Uppercase letter and followed by either Upper or Lowercase

  • Minimum 2 words

  • Maximum 4 words

  • Words will include only A-Z or a-z chars


What I Tried:



import re

re.findall("[A-Z][A-Za-z]+ [A-Z][A-Za-z]+ [A-Za-z]* [A-Za-z]*", text)


Which will correctly identifies input like:



Sam Peters John Doe

SAM WINCH DAN BROWN


but fails on input with less than 4 words.






python regex







share|improve this question













I'm trying to fetch below patterns from the text using RegEx:



John Doe

JOHN DOE

Sam John Watson

Sam John Lilly Watson

SAM JOHN WATSON

SAM JOHN LILLY WATSON


Input Data only contains single line and I need to find above patterns in that.



More about Pattern




  • Each word will start with a Uppercase letter and followed by either Upper or Lowercase

  • Minimum 2 words

  • Maximum 4 words

  • Words will include only A-Z or a-z chars


What I Tried:



import re

re.findall("[A-Z][A-Za-z]+ [A-Z][A-Za-z]+ [A-Za-z]* [A-Za-z]*", text)


Which will correctly identifies input like:



Sam Peters John Doe

SAM WINCH DAN BROWN


but fails on input with less than 4 words.






python regex




python regex






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 17 hours ago









Sociopath

3,43281635




3,43281635








  • 2




    If this is for a real system rather than a programming exercise, it is probably worth reading Falsehoods Programmers Believe About Names
    – mistertribs
    17 hours ago














  • 2




    If this is for a real system rather than a programming exercise, it is probably worth reading Falsehoods Programmers Believe About Names
    – mistertribs
    17 hours ago








2




2




If this is for a real system rather than a programming exercise, it is probably worth reading Falsehoods Programmers Believe About Names
– mistertribs
17 hours ago




If this is for a real system rather than a programming exercise, it is probably worth reading Falsehoods Programmers Believe About Names
– mistertribs
17 hours ago












1 Answer
1






active

oldest

votes


















3














Your pattern is failing because even with the *s after the last two character sets, the spaces next to those last two character sets are not optional. So (for example) having only 2 words in the string would only match if those two words were followed by two spaces.



I'd suggest that you start with [A-Z][A-Za-z]+ for the first word, then repeat a space followed by a word up to 3 times:



^[A-Z][A-Za-z]+(?: [A-Z][A-Za-z]+){1,3}$


https://regex101.com/r/IvSvAH/1



If there may be words with only one character (like "I" or "A"), then repeat the [A-Za-z] character sets with * instead of +.






share|improve this answer























  • works like a charm. It would be more helpful if you point out why my solution failed in this case.
    – Sociopath
    17 hours ago






  • 3




    @Sociopath I might also suggest a new username. But +1 to this answer.
    – Tim Biegeleisen
    17 hours ago











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














Your pattern is failing because even with the *s after the last two character sets, the spaces next to those last two character sets are not optional. So (for example) having only 2 words in the string would only match if those two words were followed by two spaces.



I'd suggest that you start with [A-Z][A-Za-z]+ for the first word, then repeat a space followed by a word up to 3 times:



^[A-Z][A-Za-z]+(?: [A-Z][A-Za-z]+){1,3}$


https://regex101.com/r/IvSvAH/1



If there may be words with only one character (like "I" or "A"), then repeat the [A-Za-z] character sets with * instead of +.






share|improve this answer























  • works like a charm. It would be more helpful if you point out why my solution failed in this case.
    – Sociopath
    17 hours ago






  • 3




    @Sociopath I might also suggest a new username. But +1 to this answer.
    – Tim Biegeleisen
    17 hours ago
















3














Your pattern is failing because even with the *s after the last two character sets, the spaces next to those last two character sets are not optional. So (for example) having only 2 words in the string would only match if those two words were followed by two spaces.



I'd suggest that you start with [A-Z][A-Za-z]+ for the first word, then repeat a space followed by a word up to 3 times:



^[A-Z][A-Za-z]+(?: [A-Z][A-Za-z]+){1,3}$


https://regex101.com/r/IvSvAH/1



If there may be words with only one character (like "I" or "A"), then repeat the [A-Za-z] character sets with * instead of +.






share|improve this answer























  • works like a charm. It would be more helpful if you point out why my solution failed in this case.
    – Sociopath
    17 hours ago






  • 3




    @Sociopath I might also suggest a new username. But +1 to this answer.
    – Tim Biegeleisen
    17 hours ago














3












3








3






Your pattern is failing because even with the *s after the last two character sets, the spaces next to those last two character sets are not optional. So (for example) having only 2 words in the string would only match if those two words were followed by two spaces.



I'd suggest that you start with [A-Z][A-Za-z]+ for the first word, then repeat a space followed by a word up to 3 times:



^[A-Z][A-Za-z]+(?: [A-Z][A-Za-z]+){1,3}$


https://regex101.com/r/IvSvAH/1



If there may be words with only one character (like "I" or "A"), then repeat the [A-Za-z] character sets with * instead of +.






share|improve this answer














Your pattern is failing because even with the *s after the last two character sets, the spaces next to those last two character sets are not optional. So (for example) having only 2 words in the string would only match if those two words were followed by two spaces.



I'd suggest that you start with [A-Z][A-Za-z]+ for the first word, then repeat a space followed by a word up to 3 times:



^[A-Z][A-Za-z]+(?: [A-Z][A-Za-z]+){1,3}$


https://regex101.com/r/IvSvAH/1



If there may be words with only one character (like "I" or "A"), then repeat the [A-Za-z] character sets with * instead of +.







share|improve this answer














share|improve this answer



share|improve this answer








edited 16 hours ago

























answered 17 hours ago









CertainPerformance

75k143659




75k143659












  • works like a charm. It would be more helpful if you point out why my solution failed in this case.
    – Sociopath
    17 hours ago






  • 3




    @Sociopath I might also suggest a new username. But +1 to this answer.
    – Tim Biegeleisen
    17 hours ago


















  • works like a charm. It would be more helpful if you point out why my solution failed in this case.
    – Sociopath
    17 hours ago






  • 3




    @Sociopath I might also suggest a new username. But +1 to this answer.
    – Tim Biegeleisen
    17 hours ago
















works like a charm. It would be more helpful if you point out why my solution failed in this case.
– Sociopath
17 hours ago




works like a charm. It would be more helpful if you point out why my solution failed in this case.
– Sociopath
17 hours ago




3




3




@Sociopath I might also suggest a new username. But +1 to this answer.
– Tim Biegeleisen
17 hours ago




@Sociopath I might also suggest a new username. But +1 to this answer.
– Tim Biegeleisen
17 hours ago


















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