CODEWITHSUNDEEP
regex
Sigurd Garshol
Sigurd Garshol

Reputation: 1544

RegEx to find all matches, not just one

I'm looking for a RegEx expression that lets me find all instances that match a pattern.

PowerShell:

> if ("123 234 345 567" -match ".*(\d{3}).*") { $Matches | fl}

Name  : 1
Value : 567

Name  : 0
Value : 123 234 345 567

I'd like to also get the other three-digit values as individual matches.

-S

Upvotes: 2

Views: 619

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626802

You can use

$s = "123 234 345 567"
Select-String '\d{3}' -input $string -AllMatches | % {$_.matches.value}

See demo: enter image description here

Notes:

  • With \d{3} pattern, you can extract three consecutive digits from any context
  • With -AllMatches, you can extract all multiple occurrences/matches
  • % {$_.matches.value} will get the matched values as strings.

The pattern can also be defined in other ways:

  • (?<!\d)\d{3}(?!\d) pattern lets you extract three consecutive digits that are not enclosd with other digits
  • (?<!\d\.?)\d{3}(?!\.?\d) - to match only integer numbers consisting of 3 digits in messed-up contexts
  • (?<!\S)\d{3}(?!\S) - match three digit chunks in between whitespaces or start/end of string
  • \b\d{3}\b - match three digit numbers as whole words (not enclosed with letters, digits or underscores).

Upvotes: 1

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