regex - PHP preg_replace escaped plus sign not working -


यह 

  preg_replace ("/ [^ a-zA-Z0-9 [: स्थान:] [: खाली:] + -] / "," ", $ val);

और प्लस चिन्ह बच गए 

  preg_replace ("/ [^ a-zA-Z0-9 [: अंतरिक्ष:] [: रिक्त:] \ + -] / "," ", $ वेल);

जब मैं प्लस चिह्नों की अनुमति देना चाहता हूँ, तब से वैल के प्लस चिह्नों को निकाल रहे हैं, मैं प्लस चिह्न से ठीक से कैसे बचता हूं?

मेरा सुझाव है: 

  गूंज preg_replace ("/ [^ a-zA-Z0-9 [: space:] [: blank :] + \ -] / "," ", '::: परीक्षा +++ --- :::');

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