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Ignore case in Regular Expression

Do you want to ignore case in a regular expression? There are a variety of ways of doing it ... depending on the language you're writing. Here are some hints:

/abcd/i Perl - an i after the regular expression
eregi PHP - use eregi rather than ereg
re.I or re.IGNORECASE Python - extra parameters to the compile method
-nocase Tcl - this option is available on regexes in Tcl

But there are times yo want to apply the "ignore case" to only part of a regular expression, or use it in some other circumstances such as within Tcl's array names command. And here you can use the embedded notation of the form (?i). Here's an example - in Tcl, but this technique works for most languages these days!

set results [array names table -regexp (?i)$where]
(written 2007-09-08, updated 2007-09-07)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
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  [3789] More than just matching with a regular expression in PHP - (2012-06-30)
  [3788] Getting more than a yes / no answer from a regular expression pattern match - (2012-06-30)
  [3534] Learning to program in PHP - Regular Expression and Associative Array examples - (2011-12-01)
  [3516] Regular Expression modifiers in PHP - summary table - (2011-11-12)
  [3515] PHP - moving from ereg to preg for regular expressions - (2011-11-11)
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  [2629] Curly braces within double quoted strings in PHP - (2010-02-09)
  [2238] Handling nasty characters - Perl, PHP, Python, Tcl, Lua - (2009-06-14)
  [2165] Making Regular Expressions easy to read and maintain - (2009-05-10)
  [2046] Finding variations on a surname - (2009-02-17)
  [1799] Regular Expressions in PHP - (2008-09-16)
  [1613] Regular expression for 6 digits OR 25 digits - (2008-04-16)
  [1603] Do not SHOUT and do not whisper - (2008-04-06)
  [1533] Short and sweet and sticky - PHP form input - (2008-02-06)
  [1372] A taster PHP expression ... - (2007-09-30)
  [1195] Regular Express Primer - (2007-05-20)
  [1058] PHP Regular expression to extrtact link and text - (2007-01-31)
  [1008] Date conversion - PHP - (2006-12-26)
  [728] Looking ahead and behind in a Regular Expression - (2006-05-22)
  [716] Evaluating arithmetic expressions in configuration files - (2006-05-10)
  [642] How similar are two words - (2006-03-11)
  [608] Don't expose your regular expressions - (2006-02-15)
  [589] Robust PHP user inputs - (2006-02-03)
  [574] PHP - dividing a string up into pieces - (2006-01-23)
  [560] The fencepost problem - (2006-01-10)
  [558] Converting between acres and hectares - (2006-01-08)
  [493] Running a Perl script within a PHP page - (2005-11-12)
  [463] Splitting the difference - (2005-10-13)
  [422] PHP Magic Quotes - (2005-08-22)
  [337] the array returned by preg_match_all - (2005-06-06)
  [54] PHP and natural sorting - (2004-09-19)
  [31] Here documents - (2004-08-28)

P212 - Perl - More on Character Strings
  [4452] Binary data handling - Python and Perl - (2015-03-09)
  [3927] First match or all matches? Perl Regular Expressions - (2012-11-19)
  [3707] Converting codons via Amino Acids to Proteins in Perl - (2012-04-25)
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  [3100] Looking ahead and behind in Regular Expressions - double matching - (2010-12-23)
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  [2993] Arrays v Lists - what is the difference, why use one or the other - (2010-10-10)
  [2877] Further more advanced Perl examples - (2010-07-19)
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  [2834] Teaching examples in Perl - third and final part - (2010-06-27)
  [2801] Binary data handling with unpack in Perl - (2010-06-10)
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  [597] Storing a regular expression in a perl variable - (2006-02-09)
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  [2909] Be gentle rather than macho ... regular expression techniques - (2010-08-08)
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  [1412] Sparse and Greedy matching - Tcl 8.4 - (2007-10-27)
  [1410] Tcl / regsub - changing a string and using interesting bits - (2007-10-27)

Y115 - Additional Python Facilities
  [4709] Some gems from Intermediate Python - (2016-10-30)
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  [4536] Json load from URL, recursive display, Python 3.4 - (2015-10-14)
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  [4439] Json is the new marshall, pickle and cPickle / Python - (2015-02-22)
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  [183] The elegance of Python - (2005-01-19)


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Some other Articles
Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python)
Packages and Namespaces are like Suitcases and Aircraft
Handling Binary data in Tcl (with a note on C)
Ignore case in Regular Expression
Expanding a grid - Tcl/Tk
Stable sorting - Tcl, Perl and others
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Melksham Hotel - Five Star Kitchen!
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