Question

I need a regex to match both, integer values aswell as float numbers (whereas float numbers have a “.” as seperator). Those numbers are always in a bracket and may have a leading “+”.

What should be valid:

• (1.0)
• (1)
• (9.9)
• (10000000)
• (+15)

What should be invalid:

• 1.0 — because no bracket
• 5 — because no bracket
• (1,5) — becaue “,” instead of “.”
• (a) — because of not a number
• (1 5) — because of not only one number
• (1+5) — because… well… just failing the pattern
• [5] — because wrong brackets

Answer 1

This should work on most perl like regex engines:

/(\d+(?:\.\d+)?)/