CODEWITHSUNDEEP
phpregexpreg-match
twan
twan

Reputation: 2659

How to apply regular expressions to get a number from a dynamic string

I have a variable that can contain a few variations, it also contains a number which can be any number.

The variations:

($stuksprijs+9.075);
($stuksprijs-9.075);
($stuksprijs*9.075);

($m2+9.075);
($m2-9.075);
($m2*9.075);

($o+9.075);
($o-9.075);
($o*9.075);

These are the only variations except for the numbers in it, they can change. And I need that number.

So there can be:

($m2+5);

or

($o+8.25);

or

($stuksprijs*3);

How can I get the number from those variations? How can I get the 9.075 or 5 or 8.25 or 3 from my above examples with regular expression?

I am trying to fix this with PHP, my variable that contains the string is: $explodeberekening[1]

I read multiple regex tutorials and got it to work for a single string that never changes, but how can I write a regex to get the number from above variations?

Upvotes: 0

Views: 67

Answers (1)

JvdV
JvdV

Reputation: 75840

As per my comment, which seems to have worked, you can try:

^\(\$(?:stuksprijs|m2|o)[+*-](\d+(?:\.\d+)?)\);$

The number is captured in the 1st capture group. See the online demo.

A quick breakdown:

  • ^ - Start string anchor.
  • \(\$ - Literally match "($".
  • (?: - Open a non-capture group to list alternation:
    • stuksprijs|m2|o - Match one of these literal alternatives.
    • ) - Close non-capture group.
  • [+*-] - Match one of the symbols from the character-class.
  • ( - Open 1st capture group:
    • \d+ - 1+ digits.
    • (?:\.\d+)? - Extra optional non-capture group to match a literal dot and 1+ digits.
    • ) - Close 1st capture group.
  • \); - Literally match ");".
  • $ - End string anchor.

Upvotes: 3

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