Regex for a specific string followed by a number

Question

I have a specific string followed by number (which changes). I want a regex function for that.

The string is Pay $3.14

The regex I am using is:

"^(Pay|[0-9]*)$"

But it is not giving me the result.

Can someone please guide?

What is your question? Do you wish to confirm the string contains a digit? Do you wish to extract each sequence of digits? Must the string begin with "Pay"? Must the string contain the representation of a dollar amount? — Cary Swoveland
– Cary Swoveland, Commented Jul 28, 2020 at 21:12

Ryszard Czech · Accepted Answer · 2020-07-28 18:58:58Z

Use

\bPay\s*\$(\d+(?:\.\d+)?)

See proof. The number is in capturing group 1.

EXPLANATION

NODE                     EXPLANATION
--------------------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
--------------------------------------------------------------------------------
  Pay                      'Pay'
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  \$                       '$'
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    \d+                      digits (0-9) (1 or more times (matching
                             the most amount possible))
--------------------------------------------------------------------------------
    (?:                      group, but do not capture (optional
                             (matching the most amount possible)):
--------------------------------------------------------------------------------
      \.                       '.'
--------------------------------------------------------------------------------
      \d+                      digits (0-9) (1 or more times
                               (matching the most amount possible))
--------------------------------------------------------------------------------
    )?                       end of grouping
--------------------------------------------------------------------------------
  )                        end of \1

aaaa · Accepted Answer · 2020-07-29 19:23:11Z

0

I looked at another question of yours [https://stackoverflow.com/questions/63125938/finding-an-element-using-regex-selenium-java], and I think this is what you want:

https://regex101.com/r/OI9Tcq/1

If $ is not included in the text, then you can use: https://regex101.com/r/B8i4xe/1

Both expressions will grab just the numbers, as per this:

"Pay 13.61" I want to save the element 13.61 in a string and compare with 0.

Original Answer

https://regex101.com/r/OI9Tcq/1

In the event that this was more in line with what you want, I've attached my original answer.

edited Jul 29, 2020 at 19:23

answered Jul 28, 2020 at 19:04

aaaa

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