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      <h1 class="p_Heading1"><span class="f_Heading1">Sample Regular Expressions</span></h1>

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<td style="vertical-align:top; background-color:#dadada; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Expression</p>
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<td style="vertical-align:top; background-color:#dadada; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Meaning</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">^abc</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Match &quot;abc&quot; at beginning of line</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">abc$</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Match &quot;abc&quot; at end of line</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">^abc$</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Match the line &quot;abc&quot; exactly</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">^\s*abc</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Match &quot;abc&quot; at beginning of line, but allow leading whitespace</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">^\s*end;?\s*$</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Match a line containing only &quot;end&quot; or &quot;end;&quot; with leading or trailing whitespace</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">abc|def</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Matches either &quot;abc&quot; or &quot;def&quot;</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">a(b|c)d</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Matches &quot;abd&quot; or &quot;acd&quot;</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">a(b|c)d\1</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Matches &quot;abdb&quot; or &quot;acdc&quot;, but it does not match &quot;abdc&quot;</p>
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<p class="p_Subtitle" style="margin: 0px 0px 0px 0px;"><span class="f_Subtitle">&nbsp;</span></p>
<p class="p_Subtitle"><span class="f_Subtitle">Control characters used in above samples</span></p>
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<td style="vertical-align:top; background-color:#dadada; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Character</p>
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<td style="vertical-align:top; background-color:#dadada; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Meaning</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">^</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Beginning of line</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">$</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">End of line</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">\s</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Whitespace (a tab or space)</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">*</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Zero or more of the preceding character</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">?</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Preceding character is optional</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">|</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Alternative expression</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">( )</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Subexpressions</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">\1</p>
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<td style="vertical-align:top; background-color:#eeeeee; padding:2px; border:solid 2px #ffffff;"><p class="p_SingleSpaced">Back reference to 1st subexpression</p>
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<p class="p_Normal" style="margin: 0px 0px 0px 0px;">&nbsp;</p>
<p class="p_SingleSpaced"><span class="f_SeeAlso">See also</span></p>
<p class="p_SingleSpaced"><a href="regular_expression_reference.html" class="topiclink">Regular Expression Reference</a></p>

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