Matching a space in regex

Question

I need to match a space character in a PHP regular expression  Anyone got any ideas   I mean like  gavin schulz   the space in between the two words  I am using a regular expression to make sure that I only allow letters  number and a space  But I m not sure how to find the space  This is what I have right now    newtag   preg replace     a-zA-Z0-9s           tag

User · Answer

In Perl the switch is  s  whitespace

User · Answer

You can also use the  b for a word boundary   For the name I would use something like this      b   b   b    b      EDIT Modifying this to be a regex in Perl example  if   fullname         b    b   b      b     b           first name    1    last name    2      EDIT AGAIN Based on what you want    new tag   preg replace     s t        tag

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I am using a regex to make sure that I   only allow letters  number and a space   Then it is as simple as adding a space to what you ve already got    newtag   preg replace     a-zA-Z0-9           tag      note  I removed the s  which seemed unintentional  Certainly the s was redundant  you can restore the   if you need it   If you specifically want  a  space  as in only a single one  you will need a more complex expression than this  and might want to consider a separate non-regex piece of logic

User · Answer

Use it like this to allow for single space    newtag   preg replace     a-zA-Z0-9 s          tag

User · Answer

If you re looking for a space  that would be      one space    If you re looking for one or more  it s        that s two spaces and an asterisk  or       one space and a plus    If you re looking for common spacing  use    X   or    X   X    or    X    where X is the physical tab character  and each is preceded by a single space in all those examples    These will work in every  regex engine I ve ever seen  some of which don t even have the one-or-more     character  ugh    If you know you ll be using one of the more modern regex engines    s  and its variations are the way to go  In addition  I believe word boundaries match start and end of lines as well  important when you re looking for words that may appear without preceding or following spaces   For PHP specifically  this page may help   From your edit  it appears you want to remove all non valid characters The start of this is  note the space inside the regex     newtag   preg replace      a-zA-Z0-9           tag                                          space here   If you also want trickery to ensure there s only one space between each word and none at the start or end  that s a little more complicated  and probably another question  but the basic idea would be    newtag   preg replace                tag     convert all multispaces to space  newtag   preg replace               tag      remove space from start  newtag   preg replace               tag      and end

User · Answer

It seems to me like using a REGEX in this case would just be overkill   Why not just just strpos to find the space character   Also  there s nothing special about the space character in regular expressions  you should be able to search for it the same as you would search for any other character   That is  unless you disabled pattern whitespace  which would hardly be necessary in this case

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040 matches exactly the space character   Regexp PHP reference  New Link Escape sequences for Regex PHP

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I m trying out    space    in an instance where it looks like bloggers in WordPress are using non-standard space characters  It looks like it will work

User · Answer

Here is a everything you need to know about whitespace in regular expressions       blank    Space or tab only    space    Whitespace   s Any whitespace character  v Vertical whitespace  h Horizontal whitespace  x Ignore whitespace

[php] Matching a space in regex

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