c++ - Regex: Accepting space anywhere but at the beginning -


i'm working python bindings qt4.8 on os x.

  • i want accept digit , few other chars , white space.
  • string can empty or @ length.
  • what don't want is, string being or end white space.

my working example: '[0-9pqw\+\-\*\#\(\)\.][0-9pqw\+\-\*\# \(\)\.]*'

however, don't want repeat 2 blocks 1 containing space 1 not. there should better way guess, employing [^ ], how?

second question:

  • if want limit strings total length, how it?

thank you.

you use negative lookarounds @ beginning , end of pattern:

^(?![ ])[0-9pqw+*# ().-]*(?<![ ])$

note brackets not necessary aid readability. neither of escapes (as long put - @ end).


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