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With flags to print line numbers of matched lines, count matches, do caseinsensitive matching, invert the sense (select lines that don't match the pattern), and perform other variations of the basic idea, grep is so widely used that it has become the classic example of tool-based programming Unfortunately, not every system comes with grep or an equivalent Some systems include a regular expression library, usually called regex or regexp, that you can use to write a version of grep If neither option is available, it's easy to implement a modest subset of the full regular expression language Here we present an implementation of regular expressions, and grep to go along with it; for simplicity, the only metacharacters are A $ and a, with a specifying a repetition of the single previous period or literal character This subset provides a large fraction of the power with a tiny fraction of the programming complexity of general expressions Let's start with the match function itself Its job is to determine whether a text string matches a regular expression:
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/a match: search f o r regexp anywhere i n t e x t i n t matchcchar *regexp, char atext)
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i f (regexp[O] == ' A ' ) r e t u r n matchhere(regexp+l, t e x t ) ; /* must look even i f s t r i n g i s empty do { i f (matchhere(regexp, text)) ; return 1 ) while (*text++ != '\0'); r e t u r n 0;
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If the regular expression begins with A, the text must begin with a match of the remainder of the expression Otherwise, we walk along the text, using matchhere to see if the text matches at any position As soon as we find a match, we're done Note the use of a do-while: expressions can match the empty string (for example, B matches the empty string at the end of a line and matches any number of characters, including zero), so we must call matchhere even if the text is empty The recursive function matchhere does most of the work:
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i f (regexp[Ol == '\0') return 1 ; i f (regexp[l] == ' * ' ) r e t u r n matchstar(regexp[O], regexp+2, t e x t ) ; i f (regexp[Ol == ' $ ' && regexp[l] == '\0') r e t u r n * t e x t == '\0'; i f (*text!='\O1 && (regexp[O]==' ' I I regexp[O]==*text)) r e t u r n matchhere(regexp+l, t e x t + l ) ; r e t u r n 0;
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If the regular expression is empty, we have reached the end and thus have found a match If the expression ends with $, it matches only if the text is also at the end If the expression begins with a period, that matches any character Otherwise the expression begins with a plain character that matches itself in the text A A or B that appears in the middle of a regular expression is thus taken as a literal character, not a metacharacter Notice that matchhere calls itself after matching one character of pattern and string, so the depth of recursion can be as much as the length of the pattern The one tricky case occurs when the expression begins with a starred character, for example x* Then we call matchstar, with first argument the operand of the star (x) and subsequent arguments the pattern after the star and the text
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