CODEWITHSUNDEEP
regexautohotkey
Pardeep Bansal
Pardeep Bansal

Reputation: 141

how to match the following pattern in regex?

How can I match the the pattern any number followed by h or t or l like 1h , 126h or 1268h but not 1.1h 12.6h or 12.68h in a given paragraph.

I am writing a application that can replace 1h to 100 or 1268h to 126800 so that instead of typing 00 a person can simply place h with a number but due to some error it is also matching decimal numbers, too.

Pattern that I wrote is (\d+)(h|t|l)

Upvotes: 0

Views: 44

Answers (1)

The fourth bird
The fourth bird

Reputation: 163247

You could use a whitespace boundary to the left (?<!\S) if a positive lookbehind is supported or anchors to match the whole line.

The alternation can be written as a character class [htl]

(?<!\S)(\d+)([htl])
  • (?<!\S) Positive lookbehind, assert what is on the left is not a non whitespace char
  • (\d+) Capture group 1, match 1+ digits
  • ([htl]) Capture group 2, match either h torl`

Regex demo

Using anchors to match the whole line

^(\d+)([htl])$

Regex demo

Without a lookaround, you could match either a whitespace char or the start of the string (?:\s|^) for example:

(?:\s|^)(\d+)([htl])

Regex demo

Upvotes: 2

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