Matching patterns with regular expressions in Javascript

There's a string that goes like this: 

|Africa||Africans||African Society||Go Africa Go||Mafricano||Go Mafricano Go||West Africa|
.

I'm attempting to craft a regular expression that will only match terms containing the word Africa or any variation of it (yes to all terms above except for |Mafricano| and |Go Mafricano Go|). Each term is enclosed between two |.

Currently, I've devised: /\|[^\|]*africa[^\|]*\|/gi, which is written as follows:

  1. \| Match |
  1. [^\|]* Match zero to unlimited instances of any character except |
  1. africa Match africa literally
  1. [^\|]* Match zero to unlimited instances of any character except |
  1. \| Match |

I tried adding in ((?:\s)|(?!\w)) to make it 

/\|[^\|]*((?:\s)|(?!\w))africa[^\|]*\|/gi
. While it successfully excludes |Mafricano| and |Go Mafricano Go|, it also leaves out all other entries except for |West Africa| and |Go Africa Go|. This is a step in the right direction but I need it to include all single words with Africa and its derivatives too.

Any assistance would be appreciated?

javascriptregex

Answer №1

Try out this regular expression pattern

[^|]*\bCalifornia[a-z]*\b[^|]*

DEMO

var str = "|California||Californians||California Dreaming||Go California Go||CaliLife||West Coast|";
var arr = str.match(/[^|]*\bCalifornia[a-z]*\b[^|]*/g);
console.log(arr); // ["California", "Californians", "California Dreaming", "Go California Go", "CaliLife"]

Answer №2

Perhaps you are looking for a solution similar to this:

\|(?:(?!Mafrica|\|).)*?africa(?:(?!Mafrica|\|).)*?\|

here is a working example

> "|Africa||Africans||African Society||Go Africa Go||Mafricano||Go Mafricano Go||West Africa|".match(/\|(?:(?!Mafrica|\|).)*?africa(?:(?!Mafrica|\|).)*?\|/gi);
[ '|Africa|',
  '|Africans|',
  '|African Society|',
  '|Go Africa Go|',
  '|West Africa|' ]

Remember to use the i modifier for case insensitive matching.

Explanation:

\|                       '|'
(?:                      group, but do not capture (0 or more
                         times):
  (?!                      look ahead to see if there is not:
    Mafrica                  'Mafrica'
   |                        OR
    \|                       '|'
  )                        end of look-ahead
  .                        any character except \n
)*?                      end of grouping
africa                   'africa'
(?:                      group, but do not capture (0 or more
                         times):
  (?!                      look ahead to see if there is not:
    Mafrica                  'Mafrica'
   |                        OR
    \|                       '|'
  )                        end of look-ahead
  .                        any character except \n
)*?                      end of grouping
\|                       '|'

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