REGEXP help with anchors

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  • Creator
    Topic
  • #54933
    Mike Wilson
    Participant

    I am having some issues with getting the matches I want.  Or dont want more specifically.  

    Here is what I am doing.  

    I have fields that I am adding into a list.  

    set list

      when I echo the list i get:

      DR^NAME^HERE {MORE^DR^NAMES^N^^^MD~THIS^DOC^NAMES^P^^^MD}

      I then try and run a regexp against them:

      lsearch -regexp $list “HI”

      This matches due to the “THIS” in the second part of the list.  However, I dont want it to.  I want it to match only if HI is by itself.  

      If I take the regexp outside of tcl I can do anchors such as HIb .  Then it will only match if the list is

      DR^NAME^HERE {MORE^DR^NAMES^N^^^MD~HI^DOC^NAMES^P^^^MD}

      How do I get this regexp to work inside of TCL?  Thanks in advance for any help!

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  • Author
    Replies
    • #83506
      Rehman Masood
      Participant

      Try this,

      lsearch -regexp $list “^HI$”

    • #83507
      Keith McLeod
      Participant

      You could also use something like “[~^]HI[~^]”

      This would qualify it as being preceded or followed by a ~ or ^ character. Nothing else should make this true.

    • #83508
      Charlie Bursell
      Participant

      ^ only matches at the beginning of a string and $ at the end

      the expr:

      lsearch -inline -regexp $list {mHIM}

      m says match only at beginning of a word while M matches at the end of a word

      From lsearch man page:

      -regexp

      Pattern is treated as a regular expression and matched against each list element using the rules described in the re_syntax reference page.

      re-syntax:

      NAME

      re_syntax – Syntax of Tcl regular expressions.

      DESCRIPTION

      DIFFERENT FLAVORS OF REs

      REGULAR EXPRESSION SYNTAX

      *

      +

      ?

      {m}

      {m,}

      {m,n}

      *? +? ?? {m}? {m,}? {m,n}?

      (re)

      (?:re)

      ()

      (?:)

      [chars]

      .

      k

      c

      {

      x

      ^

      $

      (?=re)

      (?!re)

      BRACKET EXPRESSIONS

      ESCAPES

      a

      b

      B

      cX

      e

      f

      n

      r

      t

      uwxyz

      Ustuvwxyz

      v

      xhhh

      xy

      xyz

      d

      s

      w

      D

      S

      W

      A

      m

      M

      y

      Y

      Z

      m

      mnn

      METASYNTAX

      b

      c

      e

      i

      m

      n

      p

      q

      s

      t

      w

      x

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