How can I match the first occurrence of '(' in this regex

Asked Aug 12 '19 at 11:02

Active Aug 12 '19 at 11:10

Viewed 79 times

The string is:

mean(DFBg@t=(391,596))

but this pattern: \(? will match both opening brackets. How would I get the first.

    >>> import re
    >>> string = 'mean(DFBg@t=(391,596))'
    >>> x = re.findall('\(', string)
    >>> print(x)
    ['(', '(']

edited Aug 12 '19 at 11:08

asked Aug 12 '19 at 11:02

CiaranWelsh

You can use `^[^(]*\(` – anubhava Aug 12 '19 at 11:02
Wow that was quick. Thanks! – CiaranWelsh Aug 12 '19 at 11:02
Please post the whole relevant code to see what you are doing. – Wiktor Stribiżew Aug 12 '19 at 11:03
@WiktorStribiżew heres a link to the regex on Pythex: https://pythex.org/?regex=%5C(%3F&test_string=mean(DFBg%40t%3D(391%2C596))&ignorecase=0&multiline=0&dotall=0&verbose=0 – CiaranWelsh Aug 12 '19 at 11:04
2

But that is pointless. You can use `\(` to match the first `(` with `re.search(r'\(', text)`. What are you doing? Show the *code*. – Wiktor Stribiżew Aug 12 '19 at 11:05
2

Do you want to replace the first `(` only? No need for a regex, use `s.replace('(', '-', 1)` – Wiktor Stribiżew Aug 12 '19 at 11:07
@WiktorStribiżew yes actually, this is perfect. I didn't know about the third argument to replace. Thanks! – CiaranWelsh Aug 12 '19 at 11:09

0 Answers0